Portable Eutectic Solution

Hello!

I am looking to create some sort-of eutectic solution and put it in a portable container.

I will keep it frozen in a freezer (minus 20 degrees F) and then use it to keep food frozen (minus 10 degrees F) as I travel in my car.

Do you have any "recipes" that would work?
And what is the best way to store this liquid/solid?

Thank you for your suggestions & thoughts!
LaLi

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http://www.refrigeration-engineer.co...ectic-Solution

Rob

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bags of salt flake ice in full contact with food product.