Use the garden hose
I can give you an idea that I have succesfully used myself. What I did was poked some holes at equal distance in my garen hose and voila a portable, easy to use drip irrigation system was ready. All you have to do is screw it on the tap and place the hose in a way that the whol ground area is covered. Then open the tap and adjust the water pressure accordingly....
the only thing is you have to clean the holes regularly as dust and sand tend to block them....