Let's not leap onto the Parvo wagon yet. Parvo poop has a VERY distinctive odor. Not like regular runny poop. It's a certain stink that really makes your hair curl, much worse than the usual ick.
Vomiting and diarrhea? Could be a piece of bone, worm overload, rat poison, torsion, any number of things. I know money is tight, but get him to a vet. Many vets understand and will set up a payment plan. Call around and see, and do it right away. Until then, quarantine Charlie away from the other dogs and hose down everything with Lysol spray or some other disinfectant.
I cured a rescue pup of Parvo 2 years ago. Total cost was about $200.00. His brother never even got it. Both dogs are now about 70 pounds each and healthy little pigs.
I am not saying it isn't Parvo, just that it's too early to scare the OP with unfounded conclusions.
ETA, I used to work in a vet clinic in TX when there was a Parvo outbreak, just so you know I DO have some inkling of what I'm talking about.