[seansoutpost]

Could the need to manually refill water periodically be replaced by a condenser that constantly pulled ambient moisture out of the air? The total amount of water they are talking about is not very much. This seems like it could be solved without constant topping off.

[Jeema101]

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...

[NegativeLatency]

Not saying it's impossible, but there is much less water in the air at cruising altitude.

[minikites]

I'm no physicist but wouldn't you lose a bunch of energy running a condenser?

[MOARDONGZPLZ]

I remember this, and it seems similar. it condenses water at ground level with solar cells, refilling a water bottle:

http://www.jamesdysonaward.org/projects/fontus-2/

[hidroto]

https://www.youtube.com/watch?v=aPvXnmBIO7o