Quote Originally Posted by krugaan View Post
Astronomically improbable then. Almost as improbable as finding a DM who will let you do any the things you suggest.

Fine:

We've qualified that water is in the air.

Creatures are surrounded by air.

Therefore, they are in water and unable to be affected by the cantrip in the manner you suggest.
And most water probably has some bacteria in it, so you can really only use this cantrip on perfectly sterile water in a controlled environment.