Anthony Robbin's bulletin board has an interesting post about water...

Click on the title of this post to read it all, but I was surprised by this body builder's statement that... A non active person needs a half ounce of water per pound of body weight per day. That is ten 8 ounce glasses a day if your weight is 160 pounds. For every 25 pounds you exceed you ideal weight, increase it by one 8 ounce glass. An active, athletic person needs 2/3 ounce per pound which is 13-14 8 ounce glasses a day if you're 160 pounds. The more you exercise the more water you need. Spread out your water intake throughout the day. Do not drink more than 4 glasses within any given hour. After a few weeks your bladder calms down and you will urinate less frequently, but in larger amounts. . Sue :)

I lost 5 pounds in 1 week by drinking water!

One glass of water shuts down midnight hunger pangs for almost 100% of the dieters studied in a University study. Lack of water is the #1 trigger of daytime fatigue. Preliminary research indicates that 8-10 glasses of water a day could significantly ease back and joint pain for up to 80% of sufferers. A mere 2% drop in body water can trigger fuzzy short-term memory, trouble with basic math, and difficulty focusing on the computer screen or... Drinking 5 glasses of water daily decreases the risk of colon cancer by 45%, plus it can slash the risk of breast cancer by 79%, and one is 50% less likely to develop bladder cancer. Are you drinking the amount of water you should every day?