well, no go on the bud bottles. i don't know what the mtn dew bottles look like, but the bud bottles have a straight neck. if you look at the neck on the non twist off bottles, you'll see it has a collar on it.. that's what gives the capper something to pull against.

hope you can get them to work. it's a damn good idea. 16oz of malted barley pleasure on the crick.