The Home Depot or Lowes in ground sprinkler section has a lot of useful stuff... poly 1/2 inch and 1/4 inch, different wye fittings depending on how many lines you need, and multi port heads that turn a 1/2 inch poly trunkline into 6 or more lines that have adjustable valves, drippers and microsprinklers, all sizes of fountain pumps power the line... TONS of stuff pretty cheap. A digital timer is a must though for setting up the intervals.
I took a 6 line splitter and attatched it to the 1/2 inch poly, ran it to the pump in a 5 gallon bucket, cut 6 1/4 in poly lines equal length and plugged em in to the splitter.
Take the 1/4 in lines and just keep them running into your bucket, while using one to measure the amount of water you'll need in a cup, time how long it takes to reach that level, and program the timer to run for that long. The only other variable is how long it takes your plant to use that much water, so if it's not every day it is invaluable to have a digital timer that is able to program the specific days you need to water. I use a Hydrofarm digital timer... it's like $20 bucks.
Hope that helps