It has been stated by most health experts that you should drink 8 glasses of water a day. Assuming a glass is eight ounces, that makes 64 ounces daily. However, since our bodies are practically 90% water, many natural health experts have agreed water should be consumed according to your weight. In fact, half your weight in water is the going consensus. For example, if you weigh 150 lbs, you should drink 75 ounces of water daily.