How much would you have to drink? An enormous amount. Gallons and gallons of water.
These are very isolated cases, and this is extremely rare. More people by far and away are dehydrated, than having a problem with over-hydration.
What Is Water Intoxication?
If you drink a bottle of water here and there when you exercise or when you’re hot, you’ll be fine. Where you run into problems is drinking way too much too fast.