I'm not a lawn person and I am an organic gardener, so I can't help you with when to put what chemicals on your lawn.
But I have to say, water is a precious resource. The idea of pouring water on your little patch of ground for an hour every day in the middle of heat and drought is very strange to me. Look in to xeriscaping, which is dry land gardening with drought tolerant plants. It can be very beautiful. If you plant the right kind of things, you will have to water them some the first year while they are getting established. After that, you will never water and never mow.
Here's a couple other posts I have done on xeriscaping, with pictures:
https://www.helpfulgardener.com/forum/vi ... hp?t=51118
https://www.helpfulgardener.com/forum/vi ... 46#p306246
My sister lives in New Mexico and hardly anyone around her has lawns. People have adapted to growing what makes sense for their climate.