Wash your lettuce and remove any damaged leaves.
Dry your lettuce thoroughly. If you have a salad spinner, use it. It’ll remove the excess water without bruising the lettuce. If you don’t have one, gently pat the lettuce dry with a paper towel or dishtowel.
Wrap the lettuce in a dry paper towel and place it in a plastic bag or storage container.
To maintain the proper temperature and moisture level, store your lettuce in the crisper drawer in your fridge.
Replace the paper towel anytime it feels especially wet. This is the key to keeping your lettuce from getting slimy.
Check your lettuce every day or two. Remove any leaves that are beginning to go bad. This will keep the rest of the lettuce from spoiling.
In general, loose lettuce leaves should be used within 7 days.