I love kefir! Did you get kefir or kefir grains? Kefir grains look sorta like cottage cheese and are themselves edible. You put them in milk (raw milk preferably, way better for you and works better for kefir) let it sit on the counter for a few days and then strain them out for your next batch and drink the kefir you just made.
There are more detailed directions online. If you don't care for the taste, you can add honey to sweeten it, fruit, cocoa powder for a chocolate kefir. I like to make smoothies with kefir.
Kefir is a great way to get lots of good probiotics!
...you can also make water kefir which a lot of people like better.
they sort of jelly crystals...my friend is jewish and she said it a very jewish thing..i put some cinammon in it tasted just awful..