You will need one used battery operated weed killer sprayer, wash it out with liquid dish soap a couple times, don't want to leave any chemicals in in.
An x-10 universal module.
Some wire for remote switch.
1/8" I.D. length of clear tubing.
A rechargeable 7.2 V battery.
The sprayer is battery operated, it holds 4 AA (6 volts) batteries but never seemed to work great, in this instructable I upgrade the power source to 7.2 volt rechargeable battery, which could be charged with a small solar panel.
I used an x-10 universal module to control the pump. X-10 automation software to run pump 4 times a day at regular intervals.