Milk and water kefir making supplies. Kefir cultures, grains, flavors, and starter kits to make homemade kefir. Milk kefir and water kefir are both are probiotic-rich beverages; however, water kefir is dairy-free. Water kefir is also a lighter beverage and can be flavored any number of ways. Each type of kefir has unique characteristics and is made slightly differently. If you're looking to add probiotics to your daily routine, see which of these fermented beverages is best for you!