Living at the rural edge of civilization I always throw a flat of water bottles in my vehicle any time there is even a remote chance of being stranded. This costs $5.00 and can save your life. Plus, the water is still good if you don’t drink it on that trip.
Last summer there was an active forest fire and I went to visit a friend 10 miles away. My passenger was baffled when I put the water in the vehicle, but when I said there is a chance we might get stranded for a while by the fire, and I can go a lot longer without food than water, she sort of understood.
I did not bother to explain that the roll of paper towels is a great substitute for TP in an emergency.
Old newspapers work well also.