Grocery stores often have special sprinkler systems over their produce bins that periodically mist the vegetables to keep them crisp and fresh looking. Our refrigerators tend to dry things out, which leaves us with veggies that appear to have given up the ghost.
To revive your wilted produce, add 1 tablespoon of vinegar to a pan of cold water. Soak the veggies for about one hour and they should be good to go. (You can substitute lemon juice for the vinegar.)