You drink as much liquid per day as you lose through evaporation (breath and sweat), urination and defecation. This is called water balance.
https://med.libretexts.org/Courses/Metropolitan_State_University_of_Denver/Introduction_to_Nutrition_(Diker)/07%3A_Nutrients_Important_to_Fluid_and_Electrolyte_Balance/7.03%3A_Regulation_of_Water_Balance
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