A couple bottles of water, and a roll of paper towels. Come Winter add quality jumper cables, a blanket, tow strap, and a real snow shovel. (none of that folding, collapsible mini emergence snow shovels for me thank you). I'm retired so I don't have to go anywhere and use that luxury if it looks like it is going to storm or the roads are slippery.
When I worked for a living and would be gone from home from 04:00 to 20:00-21:00, there was all kinds of crap I hauled around. Gas, oil, gas&oil, axe, chainsaw, tow chains, extra tobacco, extra lighter fluid, pulp hook, Heavy coat, heavy pants, boots, wool hat, (we had great uniforms hot in the summer, cold in the winter and uncomfortable all year long). If I was going to walk I was going to be warm. couple buckets of salt & sand.