When I want to read in the tub, ebooks fail.
Hmmm... I read in the tub fairly often. Haven't drowned the Kindle yet!
If you're that worried, put the ereader in a ziplock bag. (I don't bother even at hotel hot tubs. People are good enough about not splashing others.)
"More software projects have gone awry for lack of calendar time than for all other causes combined." -- Fred Brooks, Jr., _The Mythical Man Month_