I'm pretty sure the water from your air conditioner is just condensate ... water that has condensed out of the warmer outside air. Unless the tray
it drips into is contaminated in some way -- which I seriously doubt it is -- the water should be fine to use. That's my understanding, anyway.
"Isn't it enough to see that a garden is beautiful without having to believe that there are fairies at the bottom of it too?" - Douglas Adams