Written by Stacy K, Contributing Writer What is water kefir? Water kefir is a lacto-fermented beverage made with water kefir grains and sugar water. It is easy (and relatively quick) to make, and provides an abundance of probiotics to improve digestive health. Water kefir grains are not grains at all, but rather "bacteria and yeast existing in a symbiotic relationship" (as noted by Julie of Cultures for Health.) The term grains really just describes their appearance. Because the grains feed on sugar, the resulting beverage [...]