A lot depends on the cause of the wry neck, which is just a symptom. Head injury, vitamin E deficiency, Mareks and other diseases, and heredity may all be possible causes. Can you give a few details about age and what you are seeing? Pictures may help. Vitamin E and selenium should be given in case of a deficiency. Poultry Nutridrench or Poultry Cell vitamins contain those, or you can give regular poultry vitamins in the water, and add some egg or tuna daily for selenium. If the wry neck is severe, you may need to wrap the chicken in a towel 2-3 times a day, and feed it chicken feed moistened with a lot of water to get enough to eat and drink.