When your puppy comes home from the Vet, you may need to use an eye dropper to hydrate him. just a couple drops in his mouth on the MIDDLE of his tongue. He WILL need a special diet after this, which may be extremely expensive. Parvo can destroy the intestines of even an adult dog.
It's a discussion for the vet. But no matter what, the puppy should have been vaccinated at the very beginning to prevent it. I hope you're not trying to treat a puppy at home, because that's not going to work.