Drip to waste for two plants you need

4 x 1/2 gallon per hour drip emitters ( two per plant)
4 x 1/4" barbed couplers ( 1 per emitter)
pump
some kind of res
1/2" tubing
1/4" tubing
timer for pump

If you want to recycle the nute you'll need some kind of tray to put the individual pots in, and return plumbing.

Go to a decent grow shop- if you don't tell them what you're growing, they should help you lay it out on the floor and make sure you've got all the parts. More expensive, but for a two plant system you're not spending any real $ anyway, and you can pick the staff's brain.