Big Delaware hen with what I'm guessing is an upper respiratory infection. No discharge seen from nose or eyes, but does "cough" and does a sharp head shake occasionally as though trying to clear her airway. She's eating and drinking as usual and her poop looks normal. From what I'm reading here, I wish I had some VetRx on hand to give to her, but I don't. These are the meds that I DO have; can someone tell me which to use and how to give it to her? I can put stuff in heated dog bowl that all eight hens drink from and/or, I can dose the sick hen with an eyedropper directly into her mouth. I have Doc Brown's first aid kit of bottles of meds but don't know which of them might be appropriate: Probiotic powder, Sulfadimethoxine Oral Solution 12.5%, and Oxytetracycline powder. I also have these items, which I bought from a pet shop or from some online source: Bird Cycline capsules of 250mg tetracycline hydrochloride (the bottle has an expiration date of 4/2012); and I have a sealed packet containing 10 g of Duramycin-10 Tetracycline Hydrochloride soluble antibiotic powder with instructions to use a dose of 400-800 mg per gallon of drinking water per day for CRD AIR SAC DISEASE and to use half that concentration (200 to 400 mg per gallon of water) for INFECTIOUS SYNOVITIS. I looked up the conversion tables on the web and see that 10 g equals 10,000 mg, so here's enough in the packet for 25 doses of 400 mg. [10,000 divided by 400 equals 25]. I suppose I could "eyeball" a 25th of the packet to roughly get a 400 mg dose out of the packet. What do you recommend? By the way, I myself am allergic to Sulfa drugs; will I trigger an allergic response if I handle the Sulfadimethoxine Solution to dose the hen?