In adults' body 55 % to 60 %, there is water. A newborn baby has 75 % water and when that baby turns to 1 year old, the baby has 65 % of water. No matter how much amount of water our body contains, the water leaves the body through sweat, urine and breath. Not only that, water in our body gets excreted through various activities that we do. About 2-3 litres of water is excreted like this from our body. Therefore we must drink water daily. If it is male 2.5 to 3.7 litres minimum should be drunk. For female, they must drink 2 to 2.7 litre minimum. But this is not exact because the amount of water intake depends on the place, age, environment, activity, health etc. If we don't drink water for one day, our body experience of dehydration and energy drops, mood drop, skin moisture decreases and mainly our blood pressure decreases which makes our brain tired. Also, if we drink more level of water, even that can hurt us. We experience overhydration and our body gets dil...