Lee Valley is a good resource to see what stuff you'll need for
watering supplies. They are a little expensive, but you'll get the
idea. Most of the stuff you'll need (Pump, pvc tubing, spagetti tubes
& drip irrigators) you can get at your local 'growers' store... Ie. the
hydrophonics shop that sells stuff to folks growing cash crops.
Don't know if you can get the required psi on battery, unless you
set up a good gravity feed system. But, a pump with resovoir on a
timer is simple to set up & not too costly...

Good Luck
Mathew