While it all looked like fun and games, even if those boys on Pleasure Island weren't polymorphed into a bunch of donkeys, Recreational Water Illnesses (RWIs) are a real thing and if after drinking a pint of unfiltered amusement park water the worst thing they experience is diarrhea, they can count themselves lucky. Even when properly chlorinated--which I'm guessing 19th-Century tween boy Bacchanalian nightmares probably are not--public water parks are notoriously unsanitary. You can catch anything from Legionnaire's Disease to the norovirus all due to the fact (as the CDC points out) that even with proper wiping, the average person is walking around with about 0.14 grams of fecal matter tightly lodged within their sphincter. So when you enter the water, get splashed, or are otherwise soaked to the bone on one of those wonderful flume rides we all love so much, all that fecal matter diffuses into the water. And while chlorine certainly does help, it can't always take care of *all* of it. So, no, I don't recommend drinking any of the strange water spouting from amusement park fountains.