Thank you for the replies. One of the two died last night sometime. We are so upset, as this is the third goose we've lost to this mystery illness.
The other one (I'll call it a 'her' since we don't know for sure) is still walking around, but she seems lost most of the time. And she's very weak. Her neck is so skinny, I can feel the bones easily. It's also slightly stiff. She sounds weak too. Her honk isn't as loud, it sounds a bit raspy I guess is the best way to describe it. She chews food more than she actually eats it, same with water. I think it's because her neck is so weak. Her legs are thin, and weak as well. But she can still walk, run (though not fast - at all), and climb over low things like a rock or brick.
She's healthier than the one that just died, but she's still sick. She was born in May of this year, so she's about 4 months old. Her mother and father (who's very healthy, as well as his brother) are/were born in March of 2012.
This afternoon, we gave her some activated charcoal from the pet store via a feeding tube, in case she has botulism. We don't know if it will help her, but like I said, we just can't take her to the vet. We have to try to heal her on our own. It's sad, but necessary. I read about how to give her the charcoal on the internet.
Now, for the vitamins. Are they sold at the feed store? Is the niacin separate, or do we need vitamins with it in there?
Thank you so much, we appreciate the help greatly.