To feed your cat, simply open the 5.5 oz can of Hill's Science Diet Tender Tuna Dinner. You can serve it directly in a clean cat bowl. Make sure to provide fresh water alongside the food. As for the amount, follow the feeding guidelines on the packaging, adjusting according to your cat's activity level and body condition. Keep the opened can in the fridge and use it within a couple of days. Store unopened cans in a cool, dry place. Remember, this food is only for adult cats 7 years and older. Don't feed it to kittens, pregnant, or nursing cats as they have different nutritional needs.