I have fought this as well because we have a really wet spring and then a dry summer. I do keep my lawn mowed at a good height. However, a little water does go along way. I also always try and mow the yard the day before it rains to capitalize on the upcoming rain as much as possible. I have thought about some sort of watering system, but like you, I am on a water meter. I'm thinking about looking online, to see if I can find someone to give me an estimate of a very basic system. I'm thinking about just doing the front and sides and not the large backyard.