I've said it at some point... The next thing for wfp is a return to tank hose for water reclamation (if I've spelt that right)
How would you collect the water?
We already have a system for this.
What you do is; leave the water to fall to the ground, over time it evaporates. After a while the evaporated water forms into clouds then comes back down to earth in the form of rain. Water companies collect this up and pipe it back to my tap!
Genius.
It's available everywhere but works best in Scotland.