Thanks so much for all of the advice and all of the info available on this site. I don't know what I would have done without it! I went to the local
Tractor Supply and they had Duramycin-10 in the 6.4 oz package. I searched this site for dosage info, and ended up putting 3 tsp/gallon of water. They also had a durvet vitamin and electrolyte packets for mixing in water. I found conflicting info about it, so I ended up putting 1/4 tsp in a gallon of water. I guess it's ok to have both mixed in the same water??
I mixed up some saline solution and washed her (Bertha) eye with warm saline and cotton balls. Then I applied some Terramycin ointment. Her eye seems a lot better this morning, but she's clearing a lot of clear discharge from her nostrils and shaking her head and flinging stuff.
Now the other 2 have clear discharge and sneezing, so I'm glad I started them on the Duramycin yesterday. I just hope it's an effective antibiotic for whatever ails them.
We've had these chickens a week today, and it's been way too much excitement already. I got them from a commercial farm and aren't quite old enough to be laying, yet. I wonder if the other chickens at that farm are sick??
I will keep them on the antibiotic for 14 days, and I hope they get better. It makes me feel so bad that they're sick!
Again, thanks for the replies and for all of the info available here. What a great site.