cheap, easy, mobile drip irrigation.
Drip irrigation is much more efficient than sprinklers
You need an empty jug and a pointy thing

Step 1: Poke a Small Hole in the Bottom of the Jug

I found that the corner opposite of the handle works best. Start with a small hole; you can always make it larger later.

Step 2: Fill With Water and Set It Next to a Plant

Set the jug on the uphill side of the plant. Loosen the cap.
Pay attention to what time it is (not really necessary)

Make the hole bigger if it's too slow.
I got about a gallon per hour and a half.