... Is this for real? Like a real question you are asking as a DM about to inflict dickery upon his players?
In which case, I would sincerely and seriously counsel against rapidly expanding the capability of Supernatural ability outside what has been spelled out by RAW (and golly, your use of the term "RAW" shames me, a staunch adherent of it).
I know the DM is king of his own campaign, but you'll just end up no/masochistic players if you head down this dark path.
The ability will, RAW,:
1: Destroy liquids (unless you are a water elemental, creatures aren't regarded usually as liquids. Are you considered a liquid perchance? A water elemental striding, hidden, amongst us mere mortals?)
2: Destroy potions if a will save is failed.
I wish I had the link to the Penny Arcade comic where Tycho tried this on his group and lost all his players. But the comic site search function is utter rust-monster leavings, so alas.