What's wrong with getting your stock wet? Don't you guys ever go out hunting/treking in the rain? If your gun is built proper, the wood under the barrel, behind the lock, etc. should be finished in some manner- sealed at least.
That said, about once a year I pull my barrel, and all the hardware and re-seal the stock. It doesn't take much. I just get a patch wet with some raw linseed oil and rub it down. It can take a week or so to dry completely, which is why I do it in the winter when there is less humidity.
I've been doing this for many, many years. My stock has never been water damaged. The metal parts on the other hand.... they have gotten pretty rusty after several days out in the rain.
My .02