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Giving your birds denagard as a preventative "just in case" doesnt make sense. You should only give them denagard when you highly suspect they are infected with the disease or have been tested positive. The odds of them getting MG from wild birds is slim. More likely they would get MG from you introducing an infected bird or carrying the disease on your hands, clothing and/or shoes. As far as anyone else goes...you have control over who visits your property and who gets near your birds. It's easy to say "NO."
Your birds are dying of thirst as evidenced by the necrospy result. Discard the denagard treated water and give them regular freahwater.
If your birds DO become infected with MG or MS, you give them a preventative dose for only 3 days a month, 8cc per gallon of water. The treated water is very bitter as you know, they probably wernt drinking it.