Yep. You know that hole in the ground at the Mausoleum? We filled that with water to be our well/bathtub, and, though it took quite a few trips with the buckets, pouring it from a point at the side where the water would tend to both enter the pool and slosh over, actually managed to fill it 2 blocks deep in one area. It looks a bit... er, strange, being all uneven and such. Also, if you're careful, you can pick up the water that sloshed over and use that again. Careful meaning, I think it's random as heck, but I don't understand how it works well enough to actually say. I did wind up digging one more block deep at the back of the hole so you didn't really need to crouch to get 'clean' of stench. Works great.