What yogurt machine is used? What a waste. You boil the milk and let it cool, not hot, about 50 degrees. Then, add one-fifth yogurt or a proper amount of live bacteria to the milk, stir well, add a little water to the rice cooker, and heat for about one minute. It is best that the water is not hot. Then, put the sealed yogurt raw material into the rice cooker and let it stand for about 3 hours. Take it out and put it in the refrigerator. Eat it when you come. Be careful to keep the spoon clean.