Novus you can get condensation from a desert http://gajitz.com/desert-billboard-makes-clean-drinking-water-from-thin-air/ it uses a similar idea. it has nothing to do with what is perceived as dry air. all air has moisture on the planets surface the more water vapor the faster the more volume. The bill board and other balloon idea work in places with no to little rain fall, water is everything without it everything else is useless.
Anyone in usa and in china is going to have a very large problem with water very shortly. there simply is not enough ever….