When we first got chickens a few years back, we started with the regular chick waterers but found that they got nasty in a hurry. Since poop in water can cause diseases, we decided to use a nipple from a rabbit bottle and an empty 2 liter drink bottle. Both day-old chicks (using a smaller nipple) and recently purchased pullets who have never used a water bottle take right to it...the trick is offering NO other water supply, the nipple is shiny and they're curious, so they find it fast. Here's a pic of ours, sooooo much easier to deal with than waterers:
