Cool it: First, make sure to let the meal fully cool. Refrigerate: After that, store the crockpot potato soup recipe leftovers in an airtight container in the fridge for 3-4 days. Reheat before serving. Freeze: I recommend using quart freezer bags for this soup. Also, use a cup to transfer the mixture from the pot into the bag. In the end, squeeze out excess air and seal the bags. After that, lay the bags flat in the freezer and freeze for up to 3 months. Thaw: When you decide to serve it, transfer the bags from the freezer to the fridge to thaw overnight. Another option is to place the bag in a large casserole dish with warm water. Reheat: Add it back to the slow cooker, or to a large pot on the stove pot and mix in with some milk, cream or broth if it's too thick.