One: If the school electricity permits, a small refrigerator is the best choice. Take whatever you want to refrigerate anytime and anywhere. Of course, if roommates want to refrigerate things, they can buy a small refrigerator together, which will save money.

Two: If the school electricity is not allowed, it is not impossible to secretly order a small refrigerator. If it is not found, it is.

Three: Isn't there a vending machine downstairs? You can put your watermelon there in cold storage and take it whenever you want, but the premise is that it won't be taken away by others and won't hinder others from buying things.

Four: This is also the safest and best way in school, that is, to say hello to the owner of the supermarket, mainly to get acquainted with him, so that you can put what you want to freeze in the refrigerator in his shop.

Five: buy a stick that can turn water into ice. Some treasure seems to have it. You can find it yourself.