KeVita Sparkling Probiotic Refresher is light, delicious, refreshing and fermented with our water kefirWater kefir is a lightly effervescent water based drink that is made by fermenting kefir culture grains in water with sugar. Water kefir grains do not contain grains such as wheat, they are a unique culture. Cultures that are used to ferment dairy kefir are a different strain. Fermented water kefir is the base of all of KeVita’s Sparkling Probiotic Drink and Apple Cider Vinegar Tonic. culture. Each contains live probiotics and is a delightful pick-me-up any time of day.