Your body is estimated to be about 60 to 70 percent water. Blood is mostly water, and your muscles, lungs, and brain all contain a lot of water. You need water to regulate body temperature and to provide the means for nutrients to travel to your organs and tissues. Water also transports oxygen to your cells, removes waste, and protects your joints and organs.
Some experts believe you can estimate the amount of water you need by taking your weight in pounds and dividing that number in half. That gives you the number of ounces you may want to drink each day. For example, if you weigh 160 pounds, you might want to drink at least 80 ounces of water or other fluids per day. Other factors include amount of physical activity and the climate where you are located. My water calculator can help you determine how much water you need to drink each day.
At least twenty percent of the water you need comes from the foods you eat. The rest comes from the beverages you drink. Water is probably the best choice because it's cheap and has no calories or added ingredients. Sweetened soft drinks and sodas have added sugar that adds extra calories. Sports drinks contain minerals that may help keep your electrolytes in balance, but look out for added sugar and calories that you may not want. Fruit and vegetable juices are good because they have vitamins and minerals (read labels, however -- vegetable juices may be high in sodium). Caffeinated beverages like tea and coffee count too, but too much caffeine can make you feel jittery.
from: google.com
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