A cat needs four ounces of water per five pounds of body weight daily. If you feed your cat wet food, which can contain up to 80 percent water, you can decrease its daily water intake. On the other hand, if your cat is extremely active or you live in a warm climate, ensuring it gets more water throughout the day may be necessary. If you have an indoor-outdoor cat, be sure to keep multiple water stations where your pet can easily access it whether in the house or outside.