I would store leftover pineapple salsa in a covered bowl refrigerated. The pineapple bowl itself should not be used for storing the ingredients in as it will not last as long. The pineapple bowl is purely for presentation. As far as freezing goes, this is one of those recipes that contains certain elements that will not freeze as well as others. That is, while the pineapple chunks may do okay frozen, the peppers and tomato may not. It is best to make and eat this dish fresh.