Dear Wannabe Like Stevie ('cept not dead!),Unfortunately you will need to go to a specialist tackle shop that specialises in heavy duty saltwater equipment.
Mr Vaughan used a unique multiple rod setup with steel line of varying poundages (I believe up to 120 lbs for the low E). However, I must warn you that it will require concentrated and dedicated effort to master the multi-rod playing technique.
Incidentally, the unique note-bending effects achieved by SRV are best achieved by live recording in-situ following the hooking of a large walleye, or small shark or tuna.
Yours sincerely,
Dr. Guitar