reposting this because of no _useful_ results
You could use Plastic wrap, a ziploc bag, duck tape, or something like that. you could even use a condom (Taking a cue from PopSci)
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the only problem is all i have is hand tools and a drill and im hope to use a webcam and thats not actuall undrwater operating its water proof
http://web.media.mit.edu/~tim/pix/waterproofcamera.htmlAsk Tim to convert this to a proper Instructable.