Water is the most important thing for survival. It’s much important than even food. A person can survive for about 2 months without food but for just about a week without water. For proper health, it’s important to drink sufficient water to remain hydrated. Institute of Medicine recommend 2.7 liters of water per day for women & 3.7 liters of water per day for men while some folks arbitrarily recommends 2 liters a day. Interestingly, our body has built in system for when & how much water we should drink. While percentage of water in the human body varies by age & gender, 50-65% of the average human body is water & when that water content goes below certain level, you feel the urge to drink water. So, keep water handy & make sure to have it whenever you feel thirsty! Be Cool!