I think the net net of all of this discussion is that under the proper circumstances, a dehumidifier could be a decent source of water, althought the likelihood of those circumstances is very very low.
The circumstances would be:
1) Abundant fuel or electricity
2) Scarce water
3) If you intend to drink, or bathe with it, the ability to filter it at sub-micron levels. This requires a filter specifically designed to turn non-potable water into safe drinking water. Although it is not very practical as far as flow rates and total capacity, a $20 LifeStraw would do the trick.
Amazon.com: LifeStraw Personal Water Filter: Sports & Outdoors
I could see a scenario with an extended power outage, where I had lost city water but city gas was still flowing. (The pumps that service the gas lines run on the gas in the line, so short of earthquake, gas almost never goes out, even in New England blizzards. If I had a gas powered generator, I would be able to make water with a dehumidifier and boil it on the stove to make it safe.
Of course in the case of a blizzard, I could just melt and boil snow from outside. So like I said, in some very specific circumstances getting water from a dehumidifier could make some sense. But otherwise its highly impractical.
Don