Stop at the last gas station before the track entrance, fill the jugs and go. Same gas as normal.
You only need higher octane if you've got a seriously modified, high-compression engine. The choices are then very limited... some tracks don't have race gas available, so you need to go find your local VP Fuel dealer and buy drums of the stuff.
PS: Since you're in Maine.... if you're thinking of doing track days, chime in on the NE Trackday thread....
https://www.ninjette.org/forums/showthread.php?t=308168
The season starts SOON!!!