This is super easy to do. All you need is a timer, a Rubbermaid style reservoir, a submersible pump, an irrigation manifold unit, some tubing, and some drip emitters...and some other things like teflon tape, stakes, etc. Basically, you'll have the reservoir filled with water/nutrients with a pump feeding the irrigation distribution manifold which sends a small tube to each pot with an emitter on the end of each tube. Depending on the size of your plants and the amount of water they need, you simply adjust the timer for the length and number of feedings they need per day.
Everything to build a simple system like this can be found at Home Depot/Lowes/OSH/Ace Hardware, etc. and it can be done fairly cheaply. The most expensive item will be the pump.