We live on an acre of land. We have a private well, so we pay for the electricity to get the water out of the well, but not the water.
I honestly couldn't care less about the grass. It'll grow or not. Meh.
I've never watered grass in my life, really. My MIL asked me a few weeks ago something about what kind of sprinkler we have. We don't even have one! If it doesn't rain, it is less acreage to cut for us. If it grows and looks reasonable green, no matter what is in it, it has to tough it out on our own. It's funny, because our neighbors who pay people to spray stuff on their lawn and are always watering and their grass is brown. We never do anything
to our lawn, and it's still green, even with temperatures in the 90s or 100s for weeks on end and little or no rain. I think it thrives on neglect, personally.
We DO water our raised bed vegetable gardens, our flowers in containers and our herbs in containers outside. We get food from our garden and herb garden. We put work into those gardens and we get a lot out of them, so my husband brings several dozen gallon jugs of water to the raised beds in back and I use the hose for the flowers and herbs in containers.