what meds can i give for anatipestifer disease or new duck disease?

[mstanley1026]

im fairly certain the ducks i got recently have this. well at least one and from what i read it is quite contagious. i do not live in an area that has a vet that will see ducks nor do i live near many livestock stores. the closest tractor supply is 2 hours away. i will order meds if i need to but cant figure out what i need to order. any help would be appreciated.. or is it something i can get at tractor supply?