Does sparkling water need a function? What North American reviews reveal about functional soda
Gut health gets functional soda into the basket. Then the soda it claims to replace becomes the yardstick, and that is where it wins or loses. What more than 50,000 North American reviews reveal about functional sodas, zero-sugar sodas and premium sparkling waters.
Function is spreading across the North American soft-drink aisle, and the soda giants now carry it themselves. The question every premium sparkling-water brand faces sounds simple: does it need a function too?
Consumers answer a different question. In their reviews, sparkling-water drinkers almost never ask for a function. And where function is the promise, in gut-health sodas, it is not the function they end up judging. It is the taste, measured against the soda on the label.
- Every segment of the aisle competes with the same rival: replacing soda is the first use mentioned for gut-health sodas, zero-sugar sodas and premium sparkling waters alike.
- About one gut-health soda review in four is critical, against one in seven for premium sparkling waters. The reason is taste: "medicinal" or "artificial" first, "doesn't taste like the soda it says it is" second. Digestive discomfort comes far behind.
- Aftertaste is a soda problem, not a single-brand problem: the word appears in close to one critical review in ten for every soda brand group, against fewer than three in a hundred for sparkling waters.
- The gut benefit is credited more than it is felt. It gives people a reason to try; it rarely decides the verdict.
- Sparkling water's real risk is not a missing function. It is a missing flavor.
Why this matters now
Four moves are changing the backdrop.
The reference soda is going functional. From the end of October 2026, Coca-Cola is piloting Coca-Cola Zero Sugar, Sprite Zero Sugar and Fresca with 6 g of prebiotic fiber, in parts of New York, New Jersey and Pennsylvania (Food Dive, October 7, 2026). It follows Simply Pop, Coca-Cola's own prebiotic soda launched in 2025 (FoodNavigator, February 19, 2025), and PepsiCo's $1.95 billion acquisition of Poppi, closed in May 2025 (PepsiCo, May 19, 2025). When the benchmark soda carries the benefit too, the benefit stops setting brands apart. The challenger is then judged on the one thing the original already owns: its taste.
The gut-soda pioneers now compete on loyalty. Poppi's US retail sales fell in the first half of 2026 and Olipop's growth slowed (Beverage Digest, August 5, 2026). PepsiCo puts Poppi's first half down to the move onto its own distribution system, and says the brand returned to double-digit volume growth in the third quarter (The Star / Bloomberg, October 14, 2026). Olipop's chief executive counts roughly one new better-for-you soda competitor a week, and says that while functionality and science matter, it is still taste that wins (Food Dive, October 8, 2026).
The premium water leaders are being reorganized. Nestlé and Platinum Equity are creating Peranel, a 50:50 joint venture that brings together S.Pellegrino, Perrier, Essentia, Nestlé Pure Life and more than thirty water brands, with innovation and premiumization among its stated priorities and completion expected in the first half of 2027 (Food Dive, July 24, 2026). Perrier has already tested function in the United States, with Perrier Energize, a caffeinated sparkling line launched in 2021 (Nestlé USA, May 2021).
"Healthy" is being redefined on the label. Under the FDA's updated "healthy" claim, water with fewer than 5 calories per serving, carbonated or not, flavored or not, can be called healthy, while many sweetened drinks lose the claim. Enforcement starts in February 2028 (Cooley, February 11, 2025). Sparkling water gets a health permission without adding anything.
So the real question is not which benefit to add. It is what brings people back for the next can once every can on the shelf makes a health promise. North American reviews answer it clearly.
What we listened to
The promise gets the first sip. The soda on the label judges it.
Brands talk about fiber, prebiotics and zero sugar. Consumers describe a test. In reviews, a functional soda's verdict is reached in three steps, and the middle one is where most of them are decided.
One short review captures the whole sequence: the expectation, the benchmark, the verdict.
“It didn't taste like Root Beer at all, it had a fruity/bubblegum taste. never ever ever again. i poured it out after the 1st sip.”
Review of Poppi Prebiotic Soda, 1/5
Three segments, three proof systems
Before going into the evidence, here is how the three segments compare. They share a first use and a first quality, but not the same promise, nor the same way of failing.
| Gut-health sodas | Zero-sugar sodas | Premium sparkling waters | |
|---|---|---|---|
| Promise on the can | Gut health, fiber, less sugar | Zero sugar, stevia, no artificial sweeteners | No sugar, real fruit, refreshment |
| First use mentioned | Replacing soda | Replacing soda | Replacing soda |
| First strength praised | Refreshing, easy-drinking taste | Flavor close to the original soda | Crisp, refreshing experience |
| Role of the function | A reason to try: fifth of ten strengths | Almost absent from reviews | Last of eleven strengths |
| First criticism | Medicinal or artificial taste | Sweetener aftertaste | Flavor too weak or missing |
| Share of critical reviews | About 1 in 4, the highest | In between | About 1 in 7, the lowest |
Themes ranked in each segment's analysis of positive and critical reviews. Share of critical reviews from Sensia's sentiment scoring.
1. Every segment of the aisle is fighting the same rival: soda
Gut-health sodas, zero-sugar sodas and premium sparkling waters look like three different categories on the shelf. In reviews, they do the same job first. Replacing soda, or managing a soda craving, is the most-mentioned use in all three segments, ahead of hydration, meals, mixers or a wellness routine.
“Nice flavor and taste like your drinking a "real" soda but a lot more healthy. […] I can't drink regular soda anymore it has way too much sugar. This is perfect”
Review of Olipop Prebiotic Soda, 4/5
That shared job sets a shared yardstick. A product bought to replace soda is judged against soda: its sweetness, its fizz, its flavor. The daily gut-health routine, the use that justifies the category's name, comes much further down the list.
Business implication: the competitive set of a functional soda is not other functional sodas. It is the drink it is replacing, and the consumer's memory of it.
2. Functional soda is judged on taste, not on gut health
Of the three segments, gut-health sodas draw the largest share of critical reviews, about one in four; premium sparkling waters draw the smallest, about one in seven. What critics say is the surprise. They do not, for the most part, complain that the gut benefit failed. They complain about taste.
| # | Gut-health sodas | Zero-sugar sodas | Premium sparkling waters |
|---|---|---|---|
| 1 | Unpleasant, artificial or medicinal taste | Sweetener or chemical aftertaste | Flavor too weak, absent or unlike the fruit named |
| 2 | Doesn't taste like the soda it names | Doesn't taste like the soda it names | Artificial or chemical taste |
| 3 | Lingering sweetener aftertaste | Weak, watery flavor | Bitter or harsh aftertaste |
Top three themes in critical reviews, by segment. Digestive discomfort ranks eighth of nine for gut-health sodas.
“This literally tastes like cough medicine. Very strong flavor and not in a good way.”
Review of Poppi Prebiotic Soda, 1/5
This is not one brand's problem. The word "aftertaste" appears in 8 to 10% of critical reviews for every soda brand group we checked (Olipop, Poppi, the smaller gut-health brands and Zevia), against under 3% for sparkling waters. "Medicinal" follows the same pattern: from 3 to 7% of critical soda reviews depending on the brand group, at least twice the sparkling-water level.
“Tastes like cherry cough syrup. Strong aftertaste.”
Review of Pepsi Prebiotic Cola, 3/5
And the promise does not decide the outcome. Among brands making the same gut-health promise, the share of critical reviews varies roughly threefold. Same concept, very different results: what separates them is sensory execution.
Business implication: more fiber, more prebiotics or a louder health claim will not fix a formula that fails the first sip. The lever is the finish: sweetener system, flavor fidelity, carbonation.
3. The name on the can is a promise
The second most common criticism of functional and zero-sugar sodas is not about quality in general. It is about a specific broken promise: the drink does not taste like the soda named on the can. "Cola", "root beer", "ginger ale" or "cream soda" are not flavor descriptors to consumers. They are benchmarks.
“I love root beer, but this doesn't taste like root beer at all. […] it definitely isn't anything like root beer should taste.”
Review of Poppi Prebiotic Soda, 2/5
“Doesn't resemble root beer at all and has an overly sweet, cloying, licorice-y taste.”
Review of Zevia Soda Zero Creamy Root Beer, 1/5
The same mechanism shows up in sparkling water, in reverse. There, the named fruit is the promise, and its absence is the first criticism.
Some consumers are happy with a drink that is different from soda, and good. They say so. The disappointment comes when the label promised the original.
“I didn't think it tasted anything like traditional soda on the market, regular or diet, but I found it refreshing and satisfying. I'd recommend this!”
Review of Poppi Prebiotic Soda, 5/5
Business implication: naming is a product decision. "Inspired by" sets a different test from "tastes like". Where a formula cannot hold the benchmark, the name should not invite it.
4. One ingredient, two verdicts
The ingredients that carry the promise are often the ones that break it. Stevia is the clearest case. For zero-sugar soda drinkers, it is both a reason to buy and the first reason to reject.
“I was absolutely thrilled to realize I could still have my soda and drink it too. Sweetened with Stevia and without any artificial sugars. All flavors taste great.”
Review of Zevia Cherry Cola Zero Soda, 5/5
“I hate stevia or anything other than pure cane sugar or agave as a sweetener. […] drinks with stevia in them just taste like diet sodas and diet drinks to me.”
Review of Olipop Prebiotic Soda, 1/5
The same split runs through gut-health ingredients. Prebiotics and probiotics lead the ingredients cited in reviews of gut-health sodas, and the benefit is real to many consumers. But it is mostly credited rather than experienced: people repeat what they were told, and judge what they taste.
“Good flavor. I was told it was good for your gut but I can't speak on that.”
Review of Poppi Prebiotic Soda, 5/5
“It's not particularly tasty and I felt/experienced no difference in terms of gut health.”
Review of Olipop Prebiotic Soda, 1/5
Business implication: a functional ingredient is a positioning choice as much as a formulation choice. The question is not only "does it work?" but "who does it reassure, and who does it push away?".
What each brand claims, and where reviews test it
| Brand | Territory it owns in reviews | Where reviews push back |
|---|---|---|
| Olipop | Gut health plus soda replacement, fiber | Medicinal, bitter or flat notes |
| Poppi | Gut health plus a healthier soda treat | Vinegar or stevia notes, sourness, price |
| Zevia | Zero sugar, stevia-sweetened soda | Sweetener aftertaste, cola authenticity |
| Culture Pop | Probiotic, no stevia, real fruit | Flavor seen as subtle or unlike classic soda |
| Spindrift | Real fruit, natural refreshment | Some flavors faint or sour |
| bubly | Accessible zero-calorie refreshment | Flavor too weak or artificial |
| LaCroix | Everyday, familiar sparkling water | Consumers split on how subtle the flavor is |
| Perrier, S.Pellegrino | Heritage premium sparkling water | Mineral taste, price, flavor strength |
How reviews describe each brand's territory and its main point of friction, from Sensia's narrative analysis of the North American market.
Read across the table, the pattern holds: the brands that claim a function are tested on taste, the brands that claim naturalness are tested on flavor intensity. Hardly any is tested on the benefit itself.
Functional Sodas & Premium Sparkling Water, North America
Beverages · North America · 59,000+ signals
Explore how functional sodas, zero-sugar sodas and premium sparkling waters win or lose on taste, sweeteners, function and refreshment. Compare segments and brands, and follow how each launch is received against its benchmark.
5. So, does sparkling water need a function?
Back to the question the aisle is asking. In reviews of premium sparkling waters, functional benefits come last of the eleven strengths consumers mention. Function is also almost absent from how they talk about these drinks. What they praise is refreshment, real fruit, no sugar, no sweeteners, and the fizz.
“No sugar, no calories, and very tasty. I have noticed that I just can't stand plain water. With Perrier I have no trouble staying hydrated.”
Review of Perrier Flavored Sparkling Mineral Water, 5/5
Premium sparkling water already has its permission. Its risk lies elsewhere: a flavor too faint to justify the price. "No flavor" complaints are far more frequent for sparkling waters than for sodas, and a weak or missing flavor is the first criticism of the segment.
“Has no flavor was expecting it to taste a little sweet. It's pretty much just carbonated water.”
Review of bubly Lime Sparkling Water, 1/5
That does not close the door on function. Sensia's narrative analysis of the market points to an open territory: a function that does not taste or feel like a supplement, and does not bring the aftertaste of functional soda with it. But adding a function means importing the test functional sodas already struggle with. The first proof a premium sparkling water has to deliver is more flavor, not more benefits.
Business implication: for premium sparkling water, a function is an option, not a requirement. If it is added, it should pass the same taste test as the core range.
What it means for brands
Innovation first. The first lever is the product: a formula that holds the benchmark of the soda it names, with a clean finish, before any increase in function. In premium sparkling water, flavor intensity comes before any added benefit.
Then the promise. Lead with taste and use function as proof, not the reverse. Name flavors so that the test they set is one the product can pass, and say clearly which sweetener is in the can.
| Team | Decision or question |
|---|---|
| Innovation / R&D | Is every formula benchmarked against the soda it names, and is the finish (sweetener, acidity, botanicals) tested as hard as the first sip? |
| Marketing / Brand | Does your flavor name promise more than your formula delivers: "tastes like" or "inspired by"? |
| Strategy / Category / Portfolio | As the soda itself turns functional, where does your advantage sit? For premium sparkling water, does a functional line widen the range or blur it? |
| Insights / CMI | Do you track what consumers say they actually felt separately from what they were told, launch by launch, against the benchmark? |
The order of work is the same for every segment: product first, then the promise.
The taste test is the real claim
Functional soda's promise is health. Its test is taste. As the category matures and the soda giants put function into their own colas, the brands that keep their place will be the ones whose drinks hold up against the original, sip after sip. For sparkling water, the lesson runs the other way: the permission is already there, and the work is flavor.
Frequently asked questions
Do consumers buy functional soda for gut health?
Gut health is a strong reason to try. But in reviews, the most common use is replacing soda, and the verdict is mostly about taste. Few consumers describe a felt digestive benefit; many repeat the claim.
Why do some functional sodas get so much criticism?
Mainly for taste: a medicinal or artificial note, a lingering aftertaste, and a flavor that does not match the soda named on the can. Digestive discomfort is mentioned far less often.
Is stevia the problem?
Stevia divides. For zero-sugar soda drinkers it is both a reason to buy and the first reason to reject. Aftertaste is a soda-wide complaint, not tied to one brand.
Should premium sparkling water go functional?
Consumers do not ask for it: function comes last of the strengths they mention. Their first criticism is a weak or missing flavor. A functional line can open a new territory, provided it passes the same taste test.
Methodology
Scope: consumer reviews from the Sensia Intelligence Space "Functional Sodas & Premium Sparkling Water, North America", published on Google Shopping (which aggregates reviews from walmart.com, Target and other US retailers), Walmart, Influenster and brand websites, mostly from the United States. More than 50,000 reviews across three segments: gut-health functional sodas (28 products), zero-sugar sodas (12 products) and premium flavored sparkling waters (31 products). Electrolyte drinks are analysed separately and are not included. Data as of October 23, 2026.
Rankings and shares: rankings show the order of themes in each segment's analysis. Shares of critical reviews come from Sensia's sentiment scoring of each segment. Word shares such as "aftertaste" are shares of voice: the proportion of critical reviews that use the word, one review being able to mention several themes. Reviews are mostly positive (about 8 in 10), so complaint frequency is a friction signal rather than a measure of incidence.
Brands: brand territories come from Sensia's narrative analysis of reviews and describe how consumers talk about each brand, not the brands' own claims or their sales.
Market context: public trade sources, linked in the text.
Quotes: excerpts from real, anonymous reviews, reproduced as published, shortened where marked […].
What about your brand?
The Sensia Intelligence Space "Functional Sodas & Premium Sparkling Water, North America" lets you take the exploration further. For example:
- Does premium sparkling water need a function to stay premium in North America, and what would a function without the supplement feel look like?
- When the soda itself becomes functional, which taste cues must a functional soda preserve?
- Once the novelty fades, what makes people come back to a functional soda?
- Which flavors hold the soda benchmark (cola, root beer, ginger ale), and which miss it most often?
- For a European premium water selling in North America, which proof should lead: flavor, origin or function?
Functional Sodas & Premium Sparkling Water, North America
Beverages · North America · 59,000+ signals
Explore how functional sodas, zero-sugar sodas and premium sparkling waters win or lose on taste, sweeteners, function and refreshment. Compare segments and brands, and follow how each launch is received against its benchmark.
