There is no fixed amount of water that any person should take in a day. The body uses water in order to maintain its basic functions. The kidneys will excrete some amount of water each day in order to be able to remove waste from the body. It is estimated that these requirements of the body total to about 2.5 to 3.5 litres of water a day.
However, your water intake is also determined by the temperature around you, how much you sweat, how much you exercise, the kind of work you do (sedentary or heavy exertion) etc. Breastfeeding and pregnant women would need more water. Fever is another condition that causes increased loss of water from the body. Similarly, diarrhoea and vomiting will also cause you to lose fluids.
You must remember that water is available to the body from other fluids that you drink like milk, other beverages and even from the food you eat.
A very good general rule is that you need to drink enough water so that you pass clear urine and do not feel thirsty too often. Too much water, if consumed over a period of time, should not be harmful except for the inconvenience of having to pass urine more frequently.
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