Well, for the worst case scenario where it might take more than a day just to travel home you might try one of these
**Survival Kit, Executive 72 hr.<br><i>w/ Solar Radio Upgrade Nitro-Pak.com The World Leader in Innovative & Affordable Preparedness Gear I have one of these in each of my cars at home. Could be on the "high" end of what you are looking for, but who knows...