I'm sure you'll be checking the bike over well before heading out, changing oil, clean air filter, top off fork oil, lights, bolts, nuts, fasteners, etc.
After that, most issues on the road are generally electrical in nature. So, fuses, electrical tape, then mechanically you may need chain oil, fix a flat, a few wrenches and screw drivers. Credit card, road side assistance. Small amount of cash. 1qt motor oil.
I recently rode my vintage Bullet 150 miles and the coil went out. Had to trailer it home. Then after repair, headed out again for a full day and 220 miles. No issues whatsoever. A little more valve chatter was noticed after I got home.