My wife and I have a few birds in a large flock (~100 birds) that are exhibiting signs of respiratory disease. Symptoms include: Shut eyes, Foam/Pus in eyes swollen head inactivity not drinking, We have lost one bird so far. No local vets want to perform tests on the birds to determine the exact illness. We would like to administer antibiotics. Our birds are from a lot of varieties, most of which are Ameraucana, Rhode island reds, and Black Sex Links. there are a few of the following: Orpingtons, Giant Blue Cochin, Copper Maran, Dominique and Blue Andalusian. They are pastured birds, that have access to 12 acres, but don't wonder outside of an acre or 2. they all have differnt places they go at night. some roost up on structures, others find shelter in an out-building, some go into the "chicken tractor" they were kept in as pullets, and others roost under the barn. Their diet consists of a virtually unlimited supply of wet brewers grain with the addition of scratch/layer crumbles. They have just started reaching laying age and have started laying. One of the birds is consistently laying MASSIVE shelled double yolk eggs. We found one shell-less egg. Is there an antibiotic that should take care of all respiratory issues? Should I treat just the birds that are exhibiting symptoms or all of the birds? If treating all birds at once, can this be easily done in their water supply? How do I ensure they get the necessary dosage and not too much too little? Do I need to isolate them from other water sources? Do I need to keep my other livestock (goats, horses, pigs, turkey) away from the treated water?