Dehumidifier water is incredibly energy inefficient and unsafe for human consumption, not to mention they don't work well when the air isn't humid.

As far as energy cost and environmental impact is concerned, you are legitimately far better off shipping freshwater to Flint than trying to use dehumidifiers.

Edit: I should clarify that I am in no ways anti-technology, but it needs to actually work and I dislike how many times snake-oil startups have peddled this idea. Please, instead of pulling water from air, ideas towards purifying already existing water will benefit us much more.