First method: Cold water storage method
If the watermelon has already been cut, wrap it in a layer of plastic wrap and squeeze out any excess air. If it hasn't been cut, put it directly into a container and pour in a basin of well water or tap water. Then soak the watermelon in it, which can extend its shelf life.
Second method: Mineral water bottle storage method
Pour clear water into a mineral water bottle and freeze it in the freezer compartment of the refrigerator.
Put edible salt into a clean container, add a small amount of water, stir it evenly, then put the watermelon in it, and take out the frozen mineral water bottle and put it into the container. This method can keep the watermelon fresh for four days without affecting its taste.