I don't keep water dishes everywhere that Harley sits, since that would mean yet another water dish for me to wash, and I'm really lazy. So instead, I bring the water dish from his cage to him when I think he might want a drink, or if he says "You ready for bed" really loudly when it isn't even close to bed time.
I offered him a drink on his tree this evening, and he decided it was time for both of us to have a bath. Baths are much better on his tree than in his house (picture pops), since those pesky cage walls aren't in the way. No video, sorry, but if you scroll down pretty fast you'll get the same effect. The bath lasted more than five minutes: