My hens don't know what the hell it is.
I installed three nipples on the bottom of an orange 5-gallon bucket. When I hung it, they were all very interested, so I tapped a bit on the emitters, making them drip. Instead of catching on, all they do is try to find the water droplets that fall on the ground. Then, they look at me and ask me to do it again. They don't even seem to notice that the water is dripping from above, they just huddle around below the bucket nipping at the water droplets on the ground when I tap the emitters.
I have tried a few times per week over the past few weeks, and none of them have caught on. Any ideas???
I might try a clear container. The pic in the original posting is a good idea, I'll find an oversize plastic water bottle and see if they get it...