I'm not a gardener, but my friend solves the watering issue by growing them hydroponically -- no dirt, no digging just a pump to circulate the nutrient solution. I'm helping him with automating the nutrient mix from concentrates. Its on hold until fall, but I have a prototype I am testing.
Most of the automation will be to detect flow stoppages and/or low nutrient levels in the circulating tank, and ultimately refill the circulating tank from concentrate reservoirs and warn when concentrate levels get low.
Its 100 degrees out there today and the plants are still alive, given my "black thumb" seems the way for a lazy man to garden