I make mine with fresh organic whole milk, organic non-instant powdered milk and a 1/4 cup of leftover yogurt or store bought (have had trouble with that before). I use a heating pad for the heat. I put the heating pad on a counter with a towel under it and a towel on top, then I put the yogurt mix in a quart(s) jar with lid and cover it with a double thickness bath towel to help keep it warm. It works really well. I was just letting it sit for 3 hours until it was firm to the touch, but now I understand it needs to sit longer so the bacteria can digest more of the milk sugar, i.e., carbs. I t always turned out nice and creamy for me and sweet, but I think that is why it needs to sit longer and be quit a bit sourer. I tried it with regular milk (not organic) and it did not turn out well at all. I wish I could use regular, it is cheaper!
Anyway enjoy your home made yogurt, girls