15 cubic millimeters? That is the size of a BB. You would lose that in a puff of wind.
Nice idea, but too small to be of any interest. Scale it up to a cubic foot. THEN, I’d pay some attention.
Scale it up to provide several gallons over night and then I’ll be interested.
I remember a 1200 baud modem. It was a start. A few years later we are using 2GB fiber connections.
These things take time.
scaling it up would be the point.
2.5 milliliters of water is about half a teaspoon... Might be better than nothing if you’re crawling across an African desert. Then again...