Yes, you can use your own yogurt as a starter for the next batch. Although, I read somewhere that every so often you should refresh it with one with all the cultures, like Stoneyfield's. I get a quart of Stoneyfield's yogurt and freeze it in ice cube trays. I store the cubes in a plastic bag in the freezer. One cube makes a batch, using 4 cups of milk. I use a little bit more - more like 4 1/2 cups. I boil the milk for a few minutes to evaporate some of the water in it. The yogurt is nice and thick and creamy. I don't like to use powdered milk - I had too much of that stuff as a kid with grownups trying to pass it off as real milk.
I learned the boiling trick from the Turkish fellow who contributes to this site. Thank you, sir!
I learned the boiling trick from the Turkish fellow who contributes to this site. Thank you, sir!