Some hand tools. Folding pliers, multi screwdriver,
visegrip, channel locks, etc.

Some sort of small screwdriver to remove hotel water shower restrictor. You can use a wadded up plastic bag if you have to take a bath. (rather than stand under the equivalent of ant spit) Deodorant. Toothbrush. What about a sweatsuit? Sweatsuits can be pajamas,jackets or make you look like you're going to the gym. Hairbrush.

Tea bags or individual coffee pouches.
Peppermint candies, because sugar is not practical. You can hold a candy on your side teeth while you drink like an old timey Russian. Maybe some spare pouches of ketchup, BBQ sauce, whatever.

2 cans of fix-a-flat (preferably green slime) stow them where they won't roll around.
Your jack works and you know how to work it?
The right tool for those special lugnuts, if so equipped?
Bonus round. 12 volt tire inflator and tire plug kit.
A traffic blinky would be great. I don't have one. Yet.
If your spare tire is flat, get it fixed.
Reflectors. Traffic vest.

You need some special meds, every day? C'mon, do I have to say it? At least have a few in your wallet.

Cell phone charger. A flashlight, but now you can use your cellphone.

A tarp will fit anywhere. A bic lighter.
Garbage bags,

AAA membership. Folding money, some change and ones. Nothing crazy.