Have you thought about using an attached TEG [1] and a few 9volts to increase the amount of water produced as an optional strap-on.
[1] - https://en.wikipedia.org/wiki/Thermoelectric_generator
[1] - https://en.wikipedia.org/wiki/Thermoelectric_generator
The initial proof-of-concept I threw together with spare parts actually used a spare TEC (19911-5L31-15CQ) [0] I had laying around. [1]
[0]: http://www.customthermoelectric.com/tecs/pdf/19911-5L31-15CQ... [1]: https://openawg.github.io/2016/01/27/blueice-alpha.html