My youngest hen(8 months) has been mouth breathing lately and isn't laying as much as usual. Since It has been pretty warm here and she is the lowest on the pecking order, she could be hot or stressed, but of course it could be a respiratory infection. I cannot remember how much Duramycin to put in the water. I have 5 chickens and want to dose their water. The dosage on the package says CRD air sac disease is 400-800 mg per gallon per day and for infectious synovitis 200-400 mg per gallon. The only measuring tools I have are American, teaspoon etc, or ML. I can't find a conversion that makes any sense to me. I don't want to OD or under medicate. Can anyone help?