I am not a lawn expert but it seems to me the more you water and fertilize your grass, the more often you have to cut it. I don't enjoy cutting my lawn so I don't water and fertilize it.
In the past 25 years that I have lived in my home, I have never watered my lawn during drought conditions. The grass survives on its own. I cut my grass high and then leave it alone. A higher length enables the grass to survive the hot and dry weather.
I admit I don't have the perfect lawn, but my yard is more or less green despite the lack of rain this spring. I am saving my water for my vegetable garden and fruit trees.