L.P.
Interesting question... I am considering having an outdoor wedding reception, and was thinking of personalizing water bottles also, but was concerned about the ink and the label itself coming off the bottles due to condensation... I haven't done any research on this yet, so I will be watching to see what others have already found! I do know they make some heavier-duty larger address labels for the computer that are supposed to resist water damage, but again, haven't really looked that far into it. But my initial thought is to do a computer label, just need info as to how well they keep! Cover it with clear packaging tape, maybe?