Water is second most important thing in human life [ please don't ask me what is first take a deep breath and think ] .
1-water made up 60% of your body
2-a person should drink 2 litres of water per day
Major fact coming
There are 7.7 billions people on earth so , if everyone drink 2 litres of water per day it will be 15.4 billion litres of water or 15.4 millions sq metre or 15400 sq km or same size as east timor [ interesting] maybe part 2 come in future