Yeah, I'd stick with normal prescrip bottles too. I've used them many times for carrying stuff that shouldn't get wet, and with the exception of the easy-off lids for the elderly they seem to be pretty waterproof, or at least as much as a film canister.
Ya know, even though I live in Ohio too and have delt with quite a few people who've been on some nasty substances, it always amazes me to talk to someone who's actually in real pain. These "Big" drugs like Percoset, Darvoset, Soma and even the big Oxycontin are talked about all the time in my local news, but if you ask most anybody who's in any real type of pain (something life-changing, for example) they've always told me it's kinda like taking an advil for a broken arm, it kinda takes the edge away but it still hurts like you wouldn't believe. You'd think in today's society with our technology they'd be able to control pain better than that. .