Here are some rough guidelines for intake of fluids, not limited to water:
http://www.mayoclinic.com/health/water/NU00283
Of course, you can need more or less depending on how much you are exercising and thus how much you are sweating.
Here are some rough guidelines for intake of fluids, not limited to water:
http://www.mayoclinic.com/health/water/NU00283
Of course, you can need more or less depending on how much you are exercising and thus how much you are sweating.