Kombucha was and still is a big trend, however Water Kefir may be taking over as the new popular gut-loving fermented drink due to how simple it is to make. I get a ton of questions about Water Kefir? Water Kefir is a probiotic beverage made with water kefir grains and sugar water. Water Kefir grains are a complex polysaccharide blend of good bacteria cultures and yeasts that live in a symbiotic relationship. Cultures of Health does a great job of outlining the composition of water kefir grains if you are interested in the science behind them through their Water Kefir Grain Composition article.