WebMD describes the healthy wonders of water. For more on the benefits of water visit www.webmd.com. Are You Drinking Enough Water? (8 of 8) Most healthy adults get enough to drink by letting their thirst guide them.But the exact amount you need depends on your size, level of activity, the weather, and your general health.You may need more water if you exercise or sweat heavily. « ‹ of 8 › »