Great answers above, so I'll just add:
Portabe jump starter
http://www.nextag.com/jump-starter-portable/search-html

Essentially just a portable battery with cables, higher end models often have various plugs and lights attached to the unit for a mulitude of situations.

I was at the gas station and this lady's car died in front of me, couple minutes and she was back on her way.

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When the shittith hittith the fanith, I suggest a blanket, MRE's and a bottle of Jack. A dashboard Jesus wouldn't hurt either.

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