Milk and water Kefir fermenting away. I bought my first cultures on Ebay.
We laughed a little when they arrived in ziploc bags in paper envelopes through the post. I thought all the terrorism propaganda would have put a stop to all that!
I just added the milk kefir grains to a jar of room temperature milk, covered with a coffee filter and put them somewhere dim and warm.
The water kefir grains were a tiny bit more difficult. For them I had to make a sugar water solution (I did say a tiny bit more difficult). I added the grains and put their jar next to the milk kefir.
For a place to grow, I chose a cupboard top in the kitchen near the fridge as that stays slightly warm year round.
After a couple of days, it seems that milk kefir is more active than water kefir. There again, it’s still early days.