Water

Yep! I have a little 16 oz dehumidifier in my grow tent and when it gets full i just dump it in one of the pots.
If I were running a huge grow, I'd have a large dehumidifier draining right into my reservoir
 
Yea if your coil is moldy that's no good and should be cleaned as soon as possible. They sell evap coil cleaner at most home improvement stores.

Other than that the worst it will have in it is whatever is floating in your air. So that may or may not be ok. For the most part probably good to go but you could potentially introduce any airborne spores directly into your medium. Not a big risk but possible.
 
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