Although this will vary greatly depending on the cat’s diet, a typical cat’s daily water requirement is about 7 fl oz (200 ml) a day. Cat’s in the wild receive most of their water intake from freshly killed prey, this comes to about 70 per cent water. A domestic cat will get some of its water needs from its food, especially if it receives canned food, but fresh water should always be available. One should always keep a close eye on how much water your cat drinks as well. For example, if your cat is always draining its dish, a medical cause such as diabetes or hypothyroidism may be the cause. If these conditions have been ruled out by your vet, then you may provide additional warm water poured over your cats food to help boost its water intake, because not enough water intake can lead to urinary disorders.
A cats water intake is very inportant! Cats that are kept outside should have fresh water available at all times. I have wrote an article on caring for an outside cat in the winter months. If you are interested, you can read it on my blog. http://cat–care.blogspot.com/