Incredible somber Hippopotamus

Usually I see this joke about gamer girl... liquids referencing urine so, at least bathwater is better? Maybe?

I doubt it's actually bathwater, probably just tap water with a few additions.

You seem a little out of the loop. Allow me to drag you, kicking and screaming, into it:
https://i.redd.it/bb97fal0bx731.png
'
Whether it is actually her bath water is difficult to say. But it's gungy water, likely with, as flyingoctopus pointed out, "a few additions." She has sold out and last I'd heard you can now find videos of people drinking it on youtube.