Most dehumidifiers are basically an air conditioner. They cool down a coil and draw air over it to cause the water to condense out. This sounds like some sort

Most dehumidifiers are basically an air conditioner. They cool down a coil and draw air over it to cause the water to condense out. This sounds like some sort of nanotech approach that causes the water to condense without needing a temperature change. It may not even require any power, if you can accept a slow rate of water collection.