The eight glasses a day theory has no real scientific base - it was probably meant as a good starting point, as each person's requirements depends on body weight, activity levels and where you live.
Here is a formula though, that will give you a good estimate on how much to drink:
Take your body weight and divide it by 16, and you will know how many 8 ounce glasses of water you should drink. For example : If you are 160lbs, you should drink 160÷16 = 10 (8 ounce) glasses of water per day.
When is a good time to drink water?
- First thing in the morning, drink at least 2 glasses of water in one straight go. Build it up to 3 glasses if you can. This will really kick start your metabolism and flush your system out.
- 15 - 30 minutes before a meal. Drink a big glass of water before eating and it will help curb the confusing signals your body sends out when it is thirsty. The result will be that you will eat less too.
- Try and drink a glass of water every two hours after meals. For example, if you finish lunch at 2:00pm, drink a glass of water at 4:00pm, then another at 6:00pm.
If you do sports, you should also make sure your body is adequately hydrated at all times.
Source
https://ezinearticles.com/2872250
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