If you go without water more than 3 days you will die; it's that important. The body cannot adapt to dehydration. Studies have shown that a fluid loss of just 2% of body weight will adversely affect circulatory functions and decrease performance. On average, an individual should drink 96 ounces of water per day. Those participating in a fat loss program should drink an additional 8 ounces of water for every 25 pounds carried over their ideal body weight. Water intake should also be increased when exercising moderately to briskly.