I'm sure they have some alternative if you do get affected by water. Maybe showers use something other than water? Or maybe it's just magic. It wouldn't surprise me.

[Yuugi blinked.]

Hmmm...you think? I've been meaning to go down there to explore, but I haven't done it yet.

[This is a guy who befriended a guy who brainwashed and tried to kill his friends. Hanging out in Hell? Sounds like a picnic.]