I'm new to chickens (now have my first batch of 4 week olds.). But I did a lot of research before they arrived and came to the conclusion that I wanted to use the horizontal nipples.
The chicks got here before the nipples did, so they used the standard chick-mason-jar-waterer for a week. Then I took that out and put in a small bucket with a horizontal nipple on each side.
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http://www.ebay.com/itm/5-HORIZONTAL-POULTRY-CHICKEN-WATERING-NIPPLES-/221392072735 )
We have (had <cry>) 3 various breeds and 4 faverolles. The EE was the first to figure it out. Took about 15 minutes. Took the next 2 about 15 more minutes and they were good. I noticed that the faverolles didn't seem too interested, but I figured that they would get with the program since their sisters were doing well with it.
Next morning I watched for quite a while and while "the 3" were still using the nipples, the faverolles still didn't seem to "get it".
I was worried about dehydration in such little bodies in such a warm enclosure, so I what I did was pick each faverolles up, put her head near a nipple, flick it so there was a drop of water in the little spout, and then stuck her beak in it. Repeat a couple times for each faverolles.
VOILLA! Ever since then everyone is with the program. There have been a few discussions between my wife and I about "are they getting enough water" since the constant fillings and cleanings of the old jar was so frequent, and now it's maintenance free except for the VERY occasional refill. But we decided to stick with it, and it's been about 2 weeks and they're all still doing just fine.
Funny you mention strange chicken behavior. With both the water and the food, when I refill them they ALL GO APESH*T like I have been starving them. Even though the feeder/waterer was still half full when I did it. I think this is just the chickens way of positive reinforcement for humans. "See, keep it full and we'll eat/drink better!!!!"
Edit: Forgot I have a video showing some of the birds drinking from said system: