... okay, the book isn't "IN" the hot tub. A few inches above it.

(typed that in case I was in for a literati linguistics lesson)

In case you weren't trying to trick me (almost did), I put a little tape over the edges of the cover where I hold it open. The humidity isn't really an issue; outside it dissipates easily.

Sauna's a little tougher, but I'm not in there often or very long.