Here are more interesting facts about water:
1.) Eight glasses a day? "It depends on your physique and type of work you do. If you are essentialy a sedentary worker, you don't need to drink as much as someone who has a field job. Water includes all fluids such as tea, coffee, and juice. Average volume? Two litres of water a day. In summer, increase that by half a litre."
2.) When there is not enough water in your system, blood runs thick and puts pressure on the heart. We have 5 liters of blood in our body and we need water to keep it flowing smoothly.
3.) By the time we start to feel thirsty, 20 to 30 percent of the volume of water in our body has already been lost. (About 70 percent of our body weight is water.) As you dehydrate, the electrolytes start drying up and energy loss begins.
4.) The less water you drink, the more the uric acid build-up. Over time, it encourages kidney stones to form.
5.) Drinking too much water, on the other hand, can lead to a condition called "hyponatremia" or water intoxication. This dillutes solum content in your blood and also forces the heart to deal with extra volume of fluids. How do you know you have drunk too much water? Signs include nausea, muscle cramps, disorientation.