10 c. tepid water
8 c. powdered milk
1 lg. can evaporated skim milk
1 (8 oz.) container plain yogurt

In a 1 gallon jar with lid, mix the water, powdered milk, and evaporated milk with a wire whisk. Measure 1 cup of the milk mixture into a small bowl. Add the yogurt and mix thoroughly. Pour this mixture back into the jar. Place the jar into a cooler. Fill cooler with water which is between 90 to 120 degrees. Place lid on cooler and the yogurt is ready to begin incubating. Incubation takes between 3 and 6 hours. Water temperature in the cooler must stay between 90 and 120 degrees. Yogurt is ready when it appears solid and molded.