Water purification system that takes humidity out of the air and converts it to drinking water?

I have a client who says he sells a Water purification system that takes humidity out of the air and converts it to drinking water. He wants to sell this to businesses with the claim that it will save them money since they don’t have to buy 5 gallon water jugs for their water cooler. Has anyone ever heard of anything like this before? If so is there a website I can check out.