Water Kefir Grains transform sugar water and fruit juice into a delicious effervescent beverage. This pop-like probiotic beverage is a great replacement for pop! After 24-48 hour fermentation water kefir has 80% of the sugars eaten by the culture. A second fermentation can be done with fruit juices to flavor it. When cared for, this culture will reproduce forever. Starter is dried for shipping.