Windmill Organics launches two organic water kefirs in the UK

Windmill Organics launched two organic water kefirs under its Raw Vibrant Living brand, Cherry and Mango & Passionfruit, in 250ml cans at a £2.89 RRP, with retailers due to receive stock from July. The drinks were positioned as naturally fermented, lightly sparkling, made with live cultures and low in sugar. For kombucha drinkers, that puts the launch in the same fermented-beverage lane, but not in the same glass.

That difference matters on a brewer’s shelf. Water kefir tends to read as lighter and fruit-led, while kombucha carries the tea-based profile and sharper fermentation bite that home brewers already know well. Windmill Organics is aiming at shoppers who want something more interesting than sparkling water and less sugary than conventional soft drinks, which makes the new cans relevant to kombucha fans tracking where fermented drinks are moving next.

Gemma Williams, head of marketing at Windmill Organics, said consumers are choosing soft drinks with “clean, natural ingredients and added functional benefits.” The company is already speaking to the same audience through Raw Vibrant Living’s kombucha line, which promises “A billion live cultures, no additives or sweeteners.” That broader portfolio also reaches beyond drinks into sauerkrauts, apple cider vinegar, tropical forest honey and extra virgin olive oil, putting the water kefirs inside a wider natural-food platform rather than a one-off launch.

The timing fits a market that has been warming to functional drinks. UK functional beverage sales grew 24.5% year-on-year, and nearly 30% of UK households now purchase functional drinks. On Ocado, kefir sales were up 30% year-on-year and kombucha sales were up 22%, signs that cultured drinks are still trading up in the chilled aisle. Market outlooks for 2026 have also pointed to moderation, premiumisation, flavour exploration and alternative formats, all of which favour a drink that can sell on taste, live cultures and lower sugar at once.

For kombucha brewers, the story is less about a rival and more about the category next door. Windmill Organics has added another cultured option to the same refrigerator conversation, and that broader familiarity can make the leap into kombucha, or back into it, feel a little easier for shoppers deciding what to grab next.