I've gotten into making and drinking my own kefir, and I just love it!
I start with organic 2% milk, heat it to simmer, then cool to room temp, add the kefir enzyme powder, and let sit for about 24 hours. It's rather like yogurt you can pour, but to me is less sour tasting than yogurt.

Supposedly it's very nutritious. So yummy, I love it over my granola instead of milk, or poured over berries and fruit especially. It's refreshing and tangy to drink a cold glass- lots of calcium and easier to digest than plain milk- I read that it has less lactose or something. I don't have a lactose problem though- just love how kefir tastes.
I used to buy commercial bottles of kefir from the supermarket, but when they ran out i tried making my own with the powder- and found it to taste WAY better than the pre-made stuff. Doesn't take much effort. When made, I put it in the fridge in a half-gallon canning Ball jar with screw top.