To use this Catit canned cat food topper, simply open a can and spread the tuna, shirasu, and sweet potato in jelly over your cat's regular food. It can be served as a daily treat or a meal topper. When storing, keep the unopened packs in a cool, dry place. Once opened, refrigerate the unused portion and use it within 2 - 3 days. Make sure to check the expiration date on the can. Also, always provide fresh water for your cat alongside this food. This product is grain - free, so it's suitable for cats with grain sensitivities.