I do this now and didn’t have to as a kid…however, I have a weird kidney problem where my kidneys will just dump water, whether or not I have the water to spare. This means that I have a minimum water requirement of 4 liters a day. It’s not as bad as when I was on a really horrible medication that started the whole issue. When I was on that medication I had to drink about 4 gallons of water a day.

End result: I have a stupid party trick where I can down a liter of fluid in about 10 seconds, and a gallon of fluid in about 5 to 10 minutes depending on how recently I’ve eaten. (I did give myself water poisoning once, but that took 8 gallons over about 14 hours)