go to walmart and get a 24 hour timer, a mop bucket, a 6 or 8 foot extension cord, some bamboo skewers and bread ties go to the pet store and get a small, cheap, SUBMERSIBLE aquarium pump and 20-25 feet of tubing that fits the pump outlet, walmart may have all that too, check around.
set your timer to the watering schedule you want, plug it into the wall
plug the extension cord into it
plug the pump into the extension cord
hookup the tubing to the pump outlet
fill the bucket with water
put the pump into the bucket
trim the tubing to length
put the tubing where you want it in the planter
push a few skewers into the soil next to the tubing
secure it all with bread ties
watch it to make sure you have the timer set correctly
clear as mud?