TIL, Water intoxication can happen if you drink too much water too fast and can be deadly

In the air forces basic training, we were made to recite this clause every morning during our initial formation and at various times throughout the day:

All trainees are reminded: drink 1/2 to 3/4 canteen per hour, not to exceed 12 canteens per day. You will drink 3 non-caffinated, non carbonated beverages with each and every meal.

I guess they were serious!