Lettuce that comes in a head, like romaine or iceberg, can keep up to a couple of weeks in the fridge. To keep it fresh as long as you can, cut off the ends but otherwise leave it intact. Don't wash those suckers until you're ready to use them. Store them in a plastic bag ...
Reviving Sad Lettuce If you notice your lettuce is wilting, you can revive it by submerging the leaves in a bowl of ice water. Let it sit for about 5 minutes, then remove and thoroughly pat dry. This will shock and crisp up the leaves. ...