I've set up my big butt (no, the water one) down the garden, and fill it with a long hose (allowed, and run permanently by the hedge roots.). Then I have water down there that I can put in a can or set to run the trickle watering - leaky pipe with mulch over it - from the butt right to the plants. I check and I can run it for two hours and it only uses about 4 cans. All into the exact right places.
I now have a trench, well half done, for the runner beans, and I will set them up with a water trickle too, in the trench if I can work it.
Garlic is doing fine without watering so far!
The pots near the house though I have to do by hand...and the greenhouse...but it's manageable.