Water from air

There is a small private company called Aqua Sciences which has developed a way to extract drinking water from the air. FEMA now has two of these systems which in their case come in 40 foot trailers and cost $1 million each. The trailers can be brought to the site of a disaster and quickly produce 2500 gallons of pure fresh water a day at a cost of 15 - 30 cents per gallon. This compares to a cost of $15 per gallon to have water trucked in. This means that FEMA can pay off the cost of each trailer in 4 days of a single disaster.
The systems work like your salt shaker in absorbing moisture from the air. Salt is hygroscopic in that it is highly attractive of water and the water, unlike ground water is pure and can be used directly. Each trailer, however, comes with a reverse osmosis system which can also produce water from brackish or contaminated water sources at the site of a hurricane, for example.
Naturally, the military is very interested in the technology since each soldier in Iraq, for example, requires 3 gallons of water per day and water convoys are common targets for our enemy over there.
It is estimated that 1 billion people around the world lack a steady source of potable water. It would be nice to have a market like that to target with a novel technology like this. I wish I could buy stock in the company.