Just bought 5 chickens from a breeder (8 months- 1.5 years old). When we got them home, one was lethargic, not eating, had watery (bubbles) around eyes and was coughing. It appeared to be getting better so I wasn't too worried, but then it died. Now I have the same symptoms in 2 of the 4 remaining chickens. I isolated the worst one- she is not eating at all and sleeps all day. I'm afraid she will die of starvation. Any suggestions for over the counter treatment or a way to force feed her? We do not have a chicken vet and have never had sick chickens before so not sure what to do.