Delicious though they are, berries are a complete pain when it comes to storage. The Kitchn says berries usually only keep for about two days. As with lettuce, the packaging most of them come in can speed the trip to mold town even faster. Berries do much better when you allow them some room to breathe, so get them in a single layer as soon as possible. If you’re determined to avoid expired food for as long as possible, a hot water bath can actually help. It sounds bizarre, but The New York Times reports a 30-second swim in water around 140 degrees Fahrenheit can keep berries from going bad better than sending them straight to the fridge.