Fresh raspberries are best stored in the punnet you bought them in (or in a breathable container if hand-picked). Avoid keeping them in the coolest part of your fridge, which is usually the back of the crisper. The best place to keep them is on a shelf near the front of the refrigerator. If you’re buying raspberries on the same day as making this raspberry lemonade, then you don’t need to refrigerate the raspberries. They have a shelf life of a day when stored at room temperature. If you’re using frozen raspberries, store them in the freezer and then remove the required quantity in advance. Make sure to fully thaw the raspberries before use.