Yeah! Hugelkultur is on my list of things to explore. Sadly we are not allowed to take the gray water outside or capture any water outside of what falls on the roof, nor are we allowed to divert any streams or anything, so if there's a longer drought we'll likely run out. Indoor water is not a problem it's just that we're limited on what we can do outside because outdoor water usage results in the water leaving the local water system and that water already has senior rights attached to it. We're also not allowed to create and kind of water runoff storage system like a swale or redirect water from the driveway.

We do have a ton of trees and shrubs and bushes and I'm going to be making some gardens with native wildflowers that should be able to resist the local weather machinations but I'd like to find some drought tolerant vegetables.