Cut the watermelon in half and set it on the counter.
Rinse the cut watermelon in the sink under cold running water. Clean off the top and sides of the melon.
Dry off the sides of the outer shell of the watermelon with a paper towel.
Wrap plastic wrap around the exposed flesh of the watermelon and place it in the fridge. A half watermelon is too large for most plastic containers. However, you can cut the watermelon into smaller pieces and put these pieces in a container also. Keep watermelon in the refrigerator if you plan on eating it within one week.
Keep the plastic wrap on and freeze the watermelon if you want to enjoy it one or two months down the road.