Avoid cow's milk when you feed your cat. Diarrhea is often the result of giving the cat cow's milk. The only fluid cats really need is fresh water. A cat's digestive system changes with age, so smaller and easily digested meals are strongly suggested. This change is likely to happen when the cat turns 7, so proteins that are easily broken down are recommended.
Whether it's moist pellets, tinned or dry food, you can meet the dietary needs of your cat in many ways. You can go for dry food or canned, depending on your preferences. If your cat has any dental problems, you probably want to stay with moist food.