Thanks for answering my questions Kay. I really appreciate it.
Unfortunately to me, this sounds a great deal like Parvo. When you described him having breath that smells like blood, it made me think that's what is going on.
Parvo is an incredibly contagious, usually fatal intestinal disease that dogs get who haven't been vaccinated thoroughly for the illness.
Unfortunately when the symptoms of Parvo appear, the dog has already been infected with the illness for a while.
The best chance at survival your dog has now is to be in a veterinary clinic, receiving intensive care. He needs IV fluids, antibiotics, medications to stop the diarrhea and eventual vomiting. Parvo is not an illness that can be successfully treated at home.
I do understand that you're in a remote location and may not have access to a vet, but I would recommend trying to find someone even if it means you have to drive a ways.
There is a great website that discusses this in depth and does go over some home treatments here: http://www.veterinarypartner.com/Content.plx?C=&A=580
IF it turns out he does have Parvo, odds aren't great, but I'll keep my fingers crossed for him and hope that it turns out he's just got an upet stomach for some reason.