Soak your celery.
The reason celery becomes limp in the refrigerator over time is because it gets dehydrated. To revive it, cut off the bottom pieces of each stalk and stand them up in a bath of cold water (add a few ice cubes to help keep it as cold as possible).
Chill your bananas.
The average shelf life for this fruit is five to seven days. Leave a bundle on the counter for longer and you’ll attract those pesky fruit flies. If you notice your bananas turning brown, stick them in the fridge. The peels will turn brown but the insides are perfectly good. (Or you could always make banana bread.)