
Yes, its a bit confusing, some of them are water kefir, I went for the milk kefir as I like smoothies. I used full cream cows milk to start but changed to semi skimmed and it works the same.
Haven't tried goats milk, but apparently its very good, also some people use unpasturised, straight from the farm, but i cant get hold of any.
I only paid 99p for mine, I can pm you the name of the seller I used or I can send you some of mine when you get your jars if you want. You can use any glass or pot, it doesn't need a lid as it needs to breathe. I just cover mine with a tea towel as it needs to be in dim light. It sounds complicated, but once you get your head round it, its simple.
You also need a plastic colander to strain it and only use stainless steel, plastic or wood spoons as metal kills it. There are some videos on "YouTube" too.
Its like a pet :)