A perfect meal to refrigerate, store them together or separately, as you prefer, in an airtight container. The brats will continue to add more flavor to the sauerkraut in storage. Reheat gently on the stove, partially covered, with a splash of water or broth on medium-low heat until your desired temperature. Freeze by wrapping tightly and separately (preferably). Allow to defrost in the refrigerator before reheating to serve as above.