Breakfast porridge is delicious when it is hot, but how to eat it when it is cold? Especially in winter. I hope my suggestion is helpful to you. Warm kettle (thermos cup) insulation method. This is the most economical way to keep warm. Even the most common kettle can easily solve the problem of heat preservation. Use a kettle for more porridge and a thermos cup for less porridge. Buy a rice cooker with timing function. Calculate the time, what time do you have to get up for dinner, and how long will it take to cook porridge. After calculation, customize the time and the rice cooker will run by itself. I got up the next day and had porridge to eat, which was neither too warm nor too hot.