Few weeks ago, looking around at amazon, I found Salton YM9 1-Quart Yogurt Maker. This device is nothing more than a worm incubator for bacteria :) It was on a discount, so I decided to give it a shot. All I can say is that I will never buy yogurt from the store again. It is twice cheaper and 100 times better( in taste and healthy ). I also got some Bulgarian bacteria and now I grow them at home and I eat them. The only problem is that this yogurt does not last as long as a store yogurt. Not that it goes bad, it just gets eaten too fast :)

Here is the procedure:
I put 1 quart of organic milk in a pot and I heat it until it start smoking ( not boiling). Than I put the pot in the sink and run cold water next to it to cool it down until it stops smoking ( around 40 degrees centigrade ). In a small cup I mix 2 teaspoons of my last batch of yogurt with a little of the worm milk, stirring carefully, not beating. After the yogurt is dissolved well I mix it with the other milk an stir. I put it in my incubator ( it can be left in a worm place with a blanket around it, or in a stove that can maintain as low as 40 centigrade. Also when I stir I run all my utensils through very hot tap water for disinfection. After about 5 hours I move the container to the refrigerator. The consistency will still be runny, but after another 2 hours in the fridge and mmmmmmm :)