Water makes up more than two thirds of human body weight, and without water, we would die in a few days. A mere 2% drop in our body's water supply can trigger signs of dehydration: fuzzy short-term memory, trouble with basic math, and difficulty focusing on smaller print, such as a computer screen. Mild dehydration is also one of the most common causes of daytime fatigue. (Up to 75% of people in developed countries have mild, chronic dehydration).

Water is important to the mechanics of the human body. The body cannot work without it, just as a car cannot run without gas and oil. In fact, all the cell and organ functions that make up our entire anatomy and physiology depend on water for their functioning. Water transports valuable nutrients to the body. Water serves as a lubricant. Water regulates body temperature. Water removes harmful toxins from the body.