if can drink so much first then say.... Not everyone can do more
than 4 litres... Not that easy... Unless you exercise a lot or
metabolic rate is damn high
Even in army, I don't think I went more than 5 litres a day....
Each time water parade 1L, one day, if got activity that sweat a
lot, then 3 times water parade... Plus some self drinking,
definitely < 5 litres...
So being sedentary will definitely be drinking less water