Here's an easy to make yogurt.

Homemade Yogurt

1/2 gallon of milk
1/2 cup of powdered milk
one container of commercial yogurt with active cultures

Heat Milk: Heat 1/2 gallon of milk to 185 degrees F. Any type of milk will
work, e.g. fat free, 2% or whole. This should take about 25 minutes in a
500 watt microwave. The temperature can be measured with a candy
thermometer. Don't boil the milk.

Add Powdered Milk: Stir in 1/2 cup of powdered milk. The additional milk
solids make the yogurt thicker.

Cool Milk: Let the milk cool to 115 degrees F or less. The yogurt does
not seem as sour if you cool to 105 degrees. Once again, you can measure
the temperature with a candy thermometer. This should take about an hour
and a half at room temperature.

Add Cultu Add one container of commercial yogurt with active cultures.
Vanilla or plain works bests. Other flavors will add color and flavor,
though they will work too. We've been using the Safeway store brand, low
fat and calorie vanilla.

Strain Mixtu Strain mixture with tea strainer to remove excess dry
milk. Otherwise the excess dry milk will leave grit at the bottom of the
bowl.

Incubate Cultu Cover with plastic wrap, and let sit at 105 to 115
degrees for 8 hours. If you turn your oven light on and set the bowl in
the oven all night, this should work. Wrapping the bowl in a bath towel
with a heating pad turned on low will also work. Don't let the temperature
go over 115 degrees or the culture may be killed.

Cool: Place bowl in refrigerator. After a few hours the yogurt should be
cool and ready to eat.

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