Whisky is the original Scotch term, whiskey is the American slang version.
Remember, we're dealing with rednecks here.
Yanks could never spell, nor get their wording right. Cases in point:-
Color instead of colour.
Vapor instead of vapoir.
Jail instead of gaol.
Aluminum instead of aluminium
etc, etc, ad hoc, ad nauseum, ad infinitum
Condominium instead of flat.
Gasolene instead of petroleum
cellphone instead of mobile phone.
4X4 instead of All Wheel Drive.
Fiduciary instead of financial
etc, etc, ad hoc, ad nauseum, ad infinitum.
Also starting sayings such as "I could care less" instead of "I could'nt care less" is just Stoopid.
I think youse all gets da pitcher already, dat's swell.