You can make a way cheaper kit than the ones you have to buy, like you said, it's getting to it.

In an EQ it's just a matter of situating it outside or in a place where you can get to it...a storage shack?

Tornadoes and hurricanes are a different problem.

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The reasoning behind a CA survival kit is to take some of the pressure off of the authorities. They will be in areas where there are buildings that have fallen and are to keep the 'little people' from over taxing the system and giving them a way to take control of their situation. (Yep, a temp feel good solution, but handy just the same.)