There is no consensus about the quantity of potable water a person should drink per day. The percentange to be drunk depends on a myriad of factors. It is often said that on average a person should drink per day about 2000 ml.
I think that there is no definite answer to your questions.
It is advised by the experts that a person should drink 1500 to 2000ml of water per day. But it is informed somewhere that the consumption depends on ones body constitution or the regional weather condition. The best advice is to drink water when one feels thirsty.