This afternoon I was visiting a co-workers home because he was proud of his handiwork erecting a privacy fence around his back yard. He'd borrowed by tractor to auger the holes and wanted to show me the final results.
Walking past his AC unit I noted a gallon bucket under the drip pipe. It was full. I asked how long it took to fill up, but he didn't know. He did say they used it to make concrete to fill the post holes. He said it was full by the time they'd finished mixing the bag, pouring the concrete and getting the next pole plumb and ready.
I was pondering starting a thread similar to this tonight!
Clearly it can produce a lot of water every day that it's hot enough to run the AC.
The water is being condensed from vapor, so it is clean for a time. Right? If a person could sterilize the coils/collector/drain system, and do it periodically, I don't see any reason why the water would not be safe to drink.
But, better safe than sorry.