The body needs no less than two quarts of water and some salt every day to compensate for its natural losses in urine, respiration, and perspiration. Less than this will cause a burden on the kidneys, which will have to work harder to concentrate the urine, excreting as much chemical toxic waste in as little water as possible. Know that your body wisdom is wiser than all the medical doctors in the world combined. Praise your body's Creator for that. This process explains why so many people end up needing dialysis in the final years of their drastically shortened lives; no thanks to the drug-medication approach in the early stage of diagnosis.
By and large, an average-sized adult body needs about four quarts of water a day. You give it two quarts in form of water ; the other two quarts are supplied from water metabolism and the water content of food/fruits. The body needs these four quarts of water to produce around two quarts of urine an amount that will prevent your kidneys from working too hard to concentrate the urine (thus the light-colored urine of well-hydrated people). Your lungs use more than a quart of water a day - this much water is evaporated in the process of breathing. The rest of the water is needed for perspiration and proper hydration of the skin (is the largest organ of the body) , which is constantly losing water into the air around it. Wrinkle skin surface is a natural mechanism to preserve further water loss due to water deficit in the body. Some water is also needed for keeping feces moist to facilitate smooth bowel movements. In hot climates more water than normal is needed for this purpose.
So How Much water?
A rough rule of thumb for those who are heavyweight is to drink 1/2 (half) ounce of water for every pound of body weight per day. A 200-pound person thus needs 100 ounces of water daily.
In metric measurement :Drink at least 10% of your own daily water-quota (31.42 ml multiply by your present body weight(kg), every 90 minutes. Use 1/4 teaspoon of sea-salt in your daily diet, for every 1250 ml water drank.
Note: every ml of water matters much to your body cells. Safer and better to drink sightly more than shortchange your body of water-ca$h flow, right?
Water should be taken anytime you're thirsty, even in the middle of a meal. Water in the middle of a meal does not drastically affect the process of digestion, but dehydration(not enough water) during food intake does.
Drink at least two glasses of water first thing in the morning to compensate for the water loss (perspiration and core-temperature maintenance) during eight hours of sleep. Air-conditioner room is drying effect and you have to drink more water.
Here are the best times to take water during the rest of the day, wake hour.
Half an hour before each major meal of the day, drink one r two glasses of water and give it time to establish its regulatory processes before you introduce food, first-bite, into your system. Those suffering from obesity, depression, or cancer should make sure to drink two glasses. During that half hour, the water is absorbed into the system and is once again secreted into the stomach, preparing it to receive solid foods. When you drink water before food, 1/2 hour prior, you avoid many problems of the gastrointestinal tract, including bloating, heartburn, colitis, constipation, diverticulitis, Crohn's disease, hiatal hernia, cancers of intestinal tract, and of course weight gain.