A retired veteran
In the military
When my dad was in the military my dad's Drill instructor would yell "ZERO" and one of the plans is for them to line up with a big canteen then he telles them to drink it until it was all gone.
Staying hydrated is very good in the military
What happens if you don't drink all your water
If you don't drink all your water the Drill instructor will yell at you asking you why you did sometimes if you reply you might throw up.So good luck if you go to the military but they will still make you drink it all.