I brought the two most listless hens up to the house. One of them just sprawled on her side in the crate with her head down. She hasn't eaten in almost 2 days no matter what I have offered her. I decided to try the Gatorade after rummaging through cabinets looking for a bottle. So I dribbled it into her mouth mainly by dripping it onto her beak, but she swallowed a bit at a time. I had her wrapped in a towel on my lap and she looked like she wasn't going to make it, but I kept dripping it in. Then I finally put her in with her buddy hen. I just picked up the towel over the crate, and she was standing up! Asleep, but on her feet. I dripped some more of the Gatorade mixed 50% with the Duramycin and she stayed asleep but swallowed.
Clearly the Gatorade has made a difference. Thanks for reminding me about it.
I am a lot more hopeful now.