My dog has had parvo for over a week will he beat the odds and survive?

my dog tested positive for parvo today but we know he has been sick longer. i was stupid and didnt think to look up his symptoms a week ago he has not been eating and he has been puking up his guts he has not had dihrreah at all. but like i said the test was positive. he has not eaten in a week and he hasnt been wanting to drink anything either. however i read that if a dog is not treated it dies within 24-72 hours of contracting the virus...we could not afford the IV drip for him but the doctor said he has high hopes of him survivng so we did not have him put to sleep. he gave my dog 2 shots to help with vomitting and some pills to bring home. he also gave me a vile to mix water and gatorade in to force him to drink. right before i took him to the vet today i actually got him to drink a little water. he seemed to be feeling a little better after that..and after the shot he seemed alot better..however after his first dose of the pills and forceing gatorade water mix down his throat he started acting bad again. now he seems to be acting fine again. i could not force the second dose of pills down his throat this time but he drank the water gatorade mix better than the last time. he is a very healthy dog..other than the whole parvo thing. i am keeping my other two dogs seperate from him and keeping them well hydrated. my fiance is a firemen and has a paramedic buddy who can give him an IV bag and needle would that help any also? i also read that if you can get the dog fully re-hydrated within 7 days they will survive and be fine. im hoping it is true but i would like some reasurance.