I too wanted to water a few things at my place. See attached photo. Here is a description top to bottom of what I did:
Top: “Frost free hose bib” (use this term to search Amazon) that turns off the water inside the wall. It includes a back flow preventer.
Splitter: Allows timer on one side, hose on other
Timer: Runs on 9V battery, choose day(s) of the week, time to start, length of time, etc.
Pressure Reducer: 30 psi for drip system
Splitter: Hose goes to one location far away, drip line goes to location close by.
In winter I remove the entire assembly, as well as the hose. Then I cover the hose bib with a foam cover for insulation.
With a simple system like this you would only need the plumber to install the hose bib.