The key to keeping berries fresh is fighting mold. Wash all of your berries in a solution of 3 cups cold water and 1 cup white vinegar and rinse with cool water. The vinegar mixture will fend off mold growth.
Dry the berries using paper towels or a salad spinner, then put them in a basket lined with paper towels on the counter. If you want to put them in the fridge, store them in the crisper with the humidity switch turned all the way down .
If your milk is getting uncomfortably close to its use-by date, you can freeze it. Just leave it in its original container and stick it right in the freezer, according to the Dairy Council of California. It will last in there 3 to 6 months. Defrost the milk by putting it back in the fridge.
If your milk doesn't ever seem to make it to its use-by date, you may be storing it wrong. Keep it out of the door and put it on the top or very bottom shelf of the fridge toward the back. Temperatures stays colder and more stable there, keeping milk fresher.
You should store lettuce a lot like you do herbs. Take them out of the bag and set the bottom into a shallow bowl of cool water. Instead of putting it in a window, though, put it in your vegetable crisper and turn the humidity setting all the way up.