He did throw money at it (if I remember correctly, been a while since I read it) but my main point in sharing it was to show what could be done with grey water. I've also found sites on the internet that have a winding waterway through their yards that has a variety of water plants and rocks...
Here is a link to a thread that was done by a man down in Las Vegas, Nevada. He set up a grey water system and using that and lots of mulch was able to grow an orchard in the Nevada desert and he even has worms now! That might not sound like much to you people back east but to get worms here...