Heat the milk to about 185 F. Cool to UNDER 120F.You heat the milk then cool it a bit
The 185 changes the structure of the milk protein, is what I've read. The under 120 F is critical, as much over that, you'll kill the yogurt culture.
1:1, unless you want to drain out some of the whey. If you do that, you can lose up to half the volume, but you'll end up with thick, Greek-style yogurt.How much milk makes how much yogurt?
The whey has lots of uses! If nothing else, pour it on blueberry or strawberry plants, or on the compost pile.
Other uses:
The liquid in a bread recipe
Liquid to cook rice or lentils or to make soup
Give it to the chickens mixed in their feed to make a mash