Bleach out your water dishes!!!!!!!!!!!!!!!!!!!!!!!!!  Look in your chicken's mouths and if there is cottage cheese stinky stuff it has started.  They say copper sulfate is a preventitive and will help cure it.  If they have it already Flagly (fish zole) will also help cure it.  They get it from Dove, pigeon salivia from the water source.  I just found all this out.  AUGH.  My poor main rooster is going through a hell of a time.  Still waiting on the flagly.