First and foremost, wash the lettuce. Even if it's prewashed, it's safest to give it another rinse yourself. For a full head of lettuce, place in a plastic bag wrapped in a damp paper towel and store in the fridge. Check every so often to see if the paper towel feels too wet, and replace it if it does to prevent slimy lettuce.u003cbr/u003eu003cbr/u003eFor individual lettuce leaves, be sure to dry them and store them in a container, preferably in the lettuce crisper in your fridge.