Thema: how do hrothgar drink

do they drink the cat way or the human way

With a straw.

Human, because MMO cat races are always humans with cat faces and tails.

Ok thinking of this mechanically, maybe like a cat, and not like a human (a polite human anyway). I can't imagine their cheeks and lips work to make the same kind of seal and negative pressure like a human's mouth would, and those fangs would make things difficult. So either they're gonna have to throw every drink back, or (if they have rough tongues) it's licking and biting droplets like other felines.

They absorb moisture via osmosis.

Don't ask how they eliminate waste. You really don't want to see it.