Different from what I originally described and expected but still need the drain part

You've got a plug in the tee: you need to buy a standard spigot with the same size thread to screw in where the plug now is. Even though the spigot will be smaller than 1", you will not have a problem with getting adequate flow from it, nor do you need anything but a standard spigot.

My main question is: Where do you live? With that setup, you need to be living somewhere that never hits freezing

Or "Winterize" it (Drain it) for the winter as one does for any sprinkler system.

I agree...if there is a shutoff valve to that line located inside the house. :-)