Yeah it would be lovely to have an automated system.
...but it will take time to test it and fiddle and adjust for all contingencies.
I suppose another option is to pay someone reliable to water according to how you show them. Do they need to be watered every day?
I watered my neighbors hanging plants and garden for her -- I was skeptical when she said the hanging plants needed to be watered *twice* a day, but it was true. I also ended up deadheading her roses and providing simple support for her husbands tomato plants because they needed it. LOL