It might sound simplistic, but we can all do better when it comes to saving water.
This shows up in practical ways, like making sure your sprinklers aren't busted and adjusting the heads when run-off leaks onto the sidewalk areas. Many times they run at times when we are indoors, so we just don't realize there's a problem. Just give them a test-run every few months to ensure they're running properly--plus, you'll have a greener lawn.
Inside the home, try to limit your shower to five minutes or less. That might not sound like a lot, but a conservative estimate shows every minute wastes 2,5 gallons of water (some estimates are higher). You can also turn the water off while you brush your teeth or scrub your hands. Just use the outside of your hand or the side of your wrist to turn the handle back on soap-free.