There are some other factors that can affect your water needs. Depending on how active you are, the climate you live in and if your pregnant or breastfeeding.
- Exercise: For a small amount of exercise that makes you sweat you will need to replace about 1.5 - 2.5 cups of water. For longer periods of exercise, such as long distance running, you will need to replace more than that, depending on how much you sweat and what type of activity you are doing. Also, during long periods of exercise it is smart to us a sports drink that contains sodium to help replace fluids. This will help to decrease or eliminate cramping, charlie horses, etc.
Click on the "Hydration Calculator" and take the quick 10 question quiz that will give you an estimate of how much water you should be drinking daily.
If you are concerned about your fluid intake you should check with your doctor or a registered dietitian. They can determine the amount of water that is best for you.
The following sites were used in my research for this post.