For anyone interested who tolerates dairy, homemade kefir is pretty easy to make. Just requires daily straining out the grains (kefir grains are the lumps of growing stuff, not a plant seed grain) and feeding them fresh milk. Cheap pasteurized milk works fine with mine, even powdered milk works. So long as it's something that contains lactose (milk sugar) which is what the little buggers eat. I drain the whey liquid from the finished product to produce something thicker like yogurt in consistency and use it that way, although the taste is different. Easier to make than homemade yogurt because kefir likes to grow at room temperature, no heat source like for yogurt making needed. Just order live kefir grains (not a commercial single-use packet of stuff) from whomever you like the sounds of selling them on line to get started. Except not in summer if it's hot or the culture will die from heat in your mail box.