Mine are doing the exact same thing!!! They have the watery/bubbly eyes and coughing. I called my county's extention office and they gave me the number for a Poultry place where I am supposed to bring in the chickens and they will test them. However, they cull the bird and do a necropsy. I sure hope what they have is something curable...
Good luck with your birds and I'll update tomorrow and let you know what I find out w. mine.
