Also, heard that you could put apple cider vinegar in their water to treat for worms??? Is that true? And if so, would it hurt to put the vinegar in the same water as the duramycin?
That's misinformation. I've been using ACV for a long time and my birds still got worms, chemical wormers work best. Don't add ACV to medicines, it can change the chemical make up of the product and may or may not harm your birds or render the product ineffective.