I rather have a half a tank of gas and ‘all that’ is a sleeping bag, a flashlight, a MRE or some lifeboat biscuits, something to drink and maybe an old sweat suit in the trunk really thank much? Really??
I once got stuck in a snowstorm with a failed water-pump.
This was well before the cell-phone era.
Due to the storm, it was several hours before anyone came to help.
Due to the blown water-pump, I couldn’t run the engine for heat.
I was very glad I had a good jacket with me.
Food and water? Would have had no use for them.
In the modern era, I always carry at least one flashlight with me.