To be clear, 2 litres per day is the amount of water you are supposed to consume, including all the water in your food. Obviously anyone working out is going to need more to compensate for sweating.

Anyone drinking 2 or more litres of soft drink per day is going to need a lot of dentistry, for starters.

Of course, that doesn't mean that tens of millions of people don't do it every single day.

It's a "sports drink." There are plenty of normal cases where you could drink 2l of Gatorade plus some water over the course of a day's hiking, skiing, biking, kayaking, etc. I wouldn't But why should I drink some bromiated compound under any conditions?