The short answer
Waterdrop sells effervescent cubes that flavour water, with no sugar and with vitamins. It is a good alternative to fizzy drinks and sugary flavoured waters, and the customer service is among the most responsive we have seen. But it is not a hydration drink in the nutritional sense: even the Microlyte, presented as electrolyte-based, provides only 248 mg of sodium per litre, and the cubes work out at 1.50 to 1.83 EUR a litre. You are paying for a flavour and packaging, not better hydration.
What our price checks found
| Range | Price of 12 cubes | Price per cube, for 500 ml | What it provides per 500 ml |
|---|---|---|---|
| Microdrink | 8.99 EUR, 9.99 EUR depending on the flavour | 0.75 EUR | 68 mg of sodium; B and C vitamins at 25% of the reference values |
| Microlyte | 10.99 EUR | 0.92 EUR | 124 mg of sodium, 120 mg of calcium, 56 mg of magnesium, 2 mg of zinc; vitamins at 50%; no potassium declared |
| Microenergy | 9.99 EUR | 0.83 EUR | 90 mg of caffeine; vitamins at 50% |
What the brand does well
A real alternative to sugary drinks
Zero sugar, virtually no calories, one sweetener, sucralose, and fruit and plant extracts. For someone who drinks fizzy drinks or juice all day, switching to a flavoured water like this is real progress.
Exemplary customer service
On Trustpilot, the brand scores 4.1 out of 5 across 18,975 reviews, of which 1,680 in the last twelve months, and replies to 96% of negative reviews, generally within a week. It is one of the best reply rates we have recorded.
A readable composition
Each page gives the values per 100 ml and per prepared drink, with the percentages of the reference values, and flags the caffeine in Microenergy as well as the groups it is not recommended for.
What you need to know before buying
Microlyte is not a sports drink
Microlyte promises « unrivalled hydration » for workouts and matches. Prepared according to the brand, it provides 248 mg of sodium per litre, zero carbohydrate and no declared potassium. European law only allows talk of water absorption from 460 mg of sodium and 80 kcal of carbohydrate per litre, because it is the combination of sodium and glucose that speeds the passage of water through the intestine. An endurance athlete loses on average about 1.2 g of sodium per hour of sweat.
| Drink, prepared according to the brand | Sodium per litre | Price per litre |
|---|---|---|
| Hydratis, 4 tablets | 232 mg | 1.98 EUR |
| Waterdrop Microlyte, 2 cubes | 248 mg | 1.83 EUR |
| Waterdrop Microdrink, 2 cubes | 136 mg | 1.50 EUR |
| Threshold for the European water absorption claim | 460 to 1,150 mg | |
| Sweat of an athlete, on average | about 825 mg | |
| WHO oral rehydration solution | 1,725 mg |
For exercise of less than an hour, water is enough. Beyond that, and especially in high heat, you need a saltier, sweeter sports drink: our guide to hydration for athletes explains how to choose one.
Microenergy contains as much caffeine as an espresso
90 mg per cube, so roughly one espresso. EFSA considers up to 400 mg a day safe for an adult, and 200 mg for a pregnant woman. The brand advises against it for children and for pregnant or breastfeeding women. Be careful not to drink it like water: three cubes make 270 mg, before you have even had the day’s coffee.
The price of flavoured water
At two cubes per litre, Microdrink works out at 1.50 EUR a litre and Microlyte at 1.83 EUR. The site promotes starter sets, bottle included, shown with large discounts against a crossed-out price. Slices of lemon, mint or red berries in a jug give you the taste without the cost.
Customer reviews
On Trustpilot, on 24/09/2026: 4.1 out of 5, 18,975 reviews, split into 81% five stars, 6% four, 2% three, 2% two and 9% one star. The brand, based in Vienna in Austria, replies to them almost systematically.
Who it suits, in practice
Yes if you want to replace fizzy drinks or juice with a sugar-free flavoured water, and the price does not bother you. Microdrink is enough.
No for rehydrating after a stomach bug, where you need a pharmacy oral rehydration solution, nor for long exercise, where you need more sodium and carbohydrate. To find out how much to drink, read our guide to how much water to drink a day. We have also reviewed Hydratis, its main competitor.
How we put this review together
We have not tested these products and we do not claim to. Prices and compositions were taken on 24/09/2026 from the brand’s official website, then compared with references from the WHO, European law, EFSA and studies on athletes’ sweat.
Our sources
- Official website waterdrop.fr, consulted on 24/09/2026: prices, nutritional values and ingredients of the Microdrink, Microlyte and Microenergy ranges.
- Regulation (EU) No 432/2012, claim on carbohydrate-electrolyte solutions: 20 to 50 mmol/L of sodium, 80 to 350 kcal/L.
- WHO and Unicef, reduced osmolarity oral rehydration solution.
- EFSA, scientific opinion on the safety of caffeine, 2015.
- Baker LB et al., J Sports Sci, 2016, PMID 26070030; Barnes KA et al., J Sports Sci, 2019, PMID 31230518.
- Trustpilot, waterdrop.fr page, consulted on 24/09/2026.