If they are eating and drinking you may want to add some unpasteurized apple cider vinegar to their water. My wife would ad some ACV and water through an eyedropper.
Vinegar: A Natural Approach to Avian Management
By Wanda Barras
"Many herbalists recommend the use of raw, unpasteurized, unheated, organic apple cider vinegar as an important dietary ingredient for humans, farm animals and pets, including birds. The Encyclopedia of Natural Pet Care describes apple cider vinegar in this way: "Long a folk remedy, cider vinegar has been shown to improve the health of dairy cows, horses, dogs and other animals. It reduces common infections, aids whelping, improves stamina, prevents muscle fatigue after exercise, increases resistance to disease and protects against food poisoning. Cider vinegar is rich in the vitamins, minerals and trace elements found in apples, especially potassium; it normalizes acid levels [pH] in the stomach, improves digestion and the assimilation of nutrients, reduces intestinal and fecal odors, helps cure constipation, alleviates some of the symptoms of arthritis and helps prevent bladder stones and urinary tract infections."
Vinegar Through The Ages
Vinegar has been used to cure ailments for centuries. For hundreds of years, folk medicine practitioners have recommended daily doses of apple cider vinegar, not only for specific medical problems, but also for overall food health. In Asia vinegar is called the friend of Chinese herbs because it is often used to process herbal preparations. It is also successfully used in modern Chinese medicine.