Seems possible in theory, and a car's A/C system already does just this. They'd just have to collect the water that normally drains from the A/C evaporator. C

Seems possible in theory, and a car's A/C system already does just this. They'd just have to collect the water that normally drains from the A/C evaporator. Could be some issues with contamination though - you don't want dirty water being injected into an engine...