If you're positive that you won't get more flats than you carry cartridges, then use a CO2 inflator and carry a couple spares.

What are the road hazards like around Wichita? If you're on mostly decent roads and ride a flat-resistant tire, then you can get away with the CO2.
If you live in goat-head thorn country and ride on super high pressure narrow, lightweight racing tires... maybe a pump is a better option.