Homemade yogurt

In the summer, yoghurt or other electricity can easily be made thick yogurt at home. We all know that yogurt's fermentation temperature is usually 30 degrees. Isn't that just the way we eat in summer? It's not a waste of energy to enjoy its work. It's been done before. It was made of yogurt from the supermarket. It worked. I did it with milk instead of milk. For the first time today, yogurt is made out of yogurt, like a tofu brain, which is no worse than what a supermarket buys, and frees all kinds of additives, and if you want to eat healthy, do it yourself。