Is there any negatives to using a nipple watering system like the one pictured here? http://tinyurl.com/2unnya I've used similar systems with hogs but never with chickens. Also, does anyone know how many birds/nipple is acceptable ? I really liked the ones for hogs. They always had fresh clean water, and I rarely had to replace them. I suppose if you didn't have many birds or had an outside hose running it you would have to come up with something else in freezing temeratures.