Hey guys, this is a shameless plug of my blog...but I wrote a story starring my chickens, Daenerys and Targaryen! http://www.myherojourney.com/2013/06/19/garden-of-ice-andfire/
Check it out!
Geoff :-)
I came across this post and have found a cheaper method! Simply use a cheap drill bit bought from any hardware store ($4.99 in this case) in the same way that you would use the auto-feeder! I'm using a plastic gallon milk carton, just make a hole in the top using a soldering iron or other method...