Listen I’m not defending the army but I’d be willing to bet 5$ that more soldiers are victims of any of the heat related illnesses (trying to sound smart here hehe, like heat exhaustion or shock or whatever) then they are of water intoxication.
Also we did the same thing when I was at basic in south Carolina. Except we didn’t have to drink the whole canteen. Just take a couple of sips, but we did it frequently.
Yeah that’s the whole point of training lol