Take 1 gallon of Vitamin D milk (he said you could add some half n half to make it creamier if you want) and bring it JUST to a boil. Turn off the heat and let cool until you can put your pinkie in the milk comfortably (yes really). Add 3-8oz of plain yogurt (that's how you get the live bacteria) and stir. He suggested just using one of the single cups of Dannon plain yogurt. Pour it all in a pot or glass bowl. Preheat your oven to the lowest setting then turn it off and put your yogurt in before you go to bed. At 9am you have perfect yogurt.
That was his exact "recipe". I have no idea what time I'm suppose to "go to bed"! I just throw it in and it's usually good in the morning. After the first batch you can just save 3-8oz of your own yogurt. After a few batches you may want to add new. I've never tried it with skim milk, I have to try that. We've been using a lot of yogurt for smoothies so I need to get back into the habit of making it. Obviously you can make a 1/2 gallon instead and just add less yogurt. He told me they would drink yogurt with salt and water to stay hydrated when he was growing up... tried that... ewwww! It was pretty gross to this "American" but I'm sure it's great for your body especially in the heat. For now I think I'll just stick to the yogurt!
Give it a try. It really couldn't be simpler!