How much water should you drink a day – by Dr Harold Gunatillake You lose about 10 cups of water every day just living, urinating, sweating, in your breath and you need to compensate that amount. One can assess whether one is dehydrated from the volume of urine pass per day and from the colour. Darker the urine, like the colour of concentrated apple juice, you are less hydrated. Drink sufficient water to keep the urine a lighter and pale in colour, then you have drunk adequate amount. You can assess whether you are dehydrated from your body weight. You lose weight as you lose water. When dehydrated you could pinch your skin, and loses its shine. Using moisture rises in addition to drinking adequate amount keep your skin healthy. To keep your skin healthy you need adequate amount of sleep, too An early sign of dehydration is thirst. Breathing ...