Any dehumidifier will drip water as a byproduct, air conditioners included. A friend has a tubes from her AC going to her carnivorous plants which like the distilled water.

I saw one recently where they used something that looked like very fine plastic filament fishnets layered on each other in this large cornucopia looking tower. I think they were capturing the mist as it came on and off a desert mountain side

Yes, take two heat pumps in series and run one as AC and another as heat and you'll get far more than 1.5 gallons of drinking water out of arid air than this

heavily patented materials science in the core - scaling their products in various ways is certainly discussed