I did a capture of Waterworld from the Bravo broadcast, which includes about half of the deleted scenes (it's a three hour cut WITH commercials). I think it could be used for a coposite edit, provided it looks better/ fits better than other sources. The quality is, of course, much nicer than the sci-fi VHS:
I think the official DVD would be better but not the same aspect ratio, and official VHS may or may not compare. I'd love to see screenshots if anyone has either of those.