Chapter 8 - Watering
Watering it with is an action applying to two things.
Understand "water [something] with/using/from/in [something]" as watering it with.
Understand "pour [something] on [something]" as watering it with (with nouns reversed).
Understand the command "wet" and "moisten" and "douse" and "soak" as "water".
Check watering something with:
say "[The second noun] [aren't] a water source." instead.
Does the player mean watering something with the noun:
it is very unlikely.