i cant get mine to drink from the nipples... how did you all?
It's a simple solution, but not one most of us would think of right away:
Remove any and all other sources of water. Thirst will drive them to find water. The red nipples catches their eyes. Flick the nipples a few times so they see the water drip.
Newborn dhicks will figure it out within an hour (usually minutes) and grown birds might take 1-8 hours to figure it out, occasionally longer for everyone to figure it out. At least that has been my experience. Of course, if it is severely hot in your locale right now, you might want to wait until early morning, evening or a cooler season of the year to do this.
Without removing water sources they are familiar with, they will be very slow to nil to learn the new source of the nipples. They will keep drinking from the familiar sources.
I setup my camera phone on video focused on our new nipple bucket (they were brand new to any sort of nipple watering) and it took 1:20 for the first chicken to figure it out.
Also, it can help if you flick or activate the nipples so that water dribbles out. Make sure at least one chicken sees you do this. Eventually they will get curious as to how that water came out and will figure it out. It took 1:20 for our adult chickens to figure it out once I flicked the nipples. It took about 16 hours for me to confirm that every single bird was using the nipples. I didn't take 16 hours of video (only about 2.5 hours) and I imagine they all had learned the nipples long before 16 hours, but during the time I was around that day and the next (not all the time), it took me that long to personally witness all of them using it.