The Track has a fuel farm with both 93 and 98 (I believe). Of course it is racing fuel so it is about $8 / gal. But you will need to bring your own oil unless Jim has added that for this year.
There is not a shop with spare parts (nuts bolts etc.). However often SAC, Shockwave or other kart stores are there to help support drivers and you may be able to purchase some parts from them, or just bum something off of one of the other racers. People are pretty good about helping out if you need something.
But if you are concerned about specific parts make sure to bring it.