[header] How to make acidophilus yogurt [title] Combine 4 cups (950ml) of milk and 3/4 cups (120 g) of powdered milk (if not using whole milk) in the saucepan. [step] Set the burner to medium heat and place the saucepan on the burner. [title] Whisk the mixture constantly to keep it from sticking to the pan. 
[step] Gradually heat the milk to 180 to 190 degrees fahrenheit (82 to 87 degrees celsius). Determine the temperature by inserting the instant read thermometer in the milk periodically.