Oh, and word of warning from my own personal experience. PVC waterers work great, so long as they aren't allowed to freeze. If they do freeze, they tend to crack.
Only thing you might run into is once they destroy the weeds, and they will in only a couple weeks, it will start to stink like chicken poop/petting zoo unless you clean it often or throw down woodchips/straw any time you get a smell starting up.
You may be able to get woodchips for free if you...