They can learn nipple waterers at a layer age. Just hold their break against out until water dribbles in their mouth they'll figure it out. They are red for a reason. Chickens peck at red.
FWIW, I've found some made for rabbits that are brass. They are spring loaded and can be mounted horizontally. No worries about keeping them vertical so they don't leak. Not sure how they would work for poultry. They also sell "t's" for mounting without drilling holes. Not sure if they are the same thread as the chicken ones. I'll check when I get them if anyone cares.
FWIW, I've found some made for rabbits that are brass. They are spring loaded and can be mounted horizontally. No worries about keeping them vertical so they don't leak. Not sure how they would work for poultry. They also sell "t's" for mounting without drilling holes. Not sure if they are the same thread as the chicken ones. I'll check when I get them if anyone cares.