Love my rain barrels may get more! Really great idea for saving water! Rain water is better to water flower beds with, so this is an awesome idea. I saw this on a show not too long ago. You can hook up your hose and water your garden too.
Kitchen or anywhere DIY. Seems simple enough, depending on your gap between shelves, anywhere from ropes to ropes for your spacing. You could even use wider wood, just adjust your rope length to accommodate your width and height of your shelves.