Store any leftover pineapple raita in an airtight container in the refrigerator for 2-3 days, depending on how fresh the ingredients were when you started. It will become thinner and a bit watery as time goes on, so give it a nice stir when you are ready to enjoy it again.  If you end up with a lot of leftovers, you can also freeze leftover pineapple pachadi in freezer-safe bags for up to 3 months. Thaw in the refrigerator overnight and stir well before diving in again.