None of it really makes sense, especially the part where idiot kids figure it out more often than harvard graduates.
First off the reason kids would guess water is because in the riddle is the word PEE and kids think that word is LAUGH OUT LOUD FUNNY and yes, so do I.
Point being kids dont answer it, they guess at it based off of the one thing they know for an absolute fact, drinking water makes them pee.
The shit about making normal people look like celebs, celebs look like normal people is stupid bullshit misdirection. Additionally the polar bear line should seal the deal for the entire riddle, but instead you get a bunch of other crap.