Much like in the US after 9/11, the only ones who are going to benefit from disaster supply kit-ups are the manufacturers, it just ends up being more short term consumerism that gets done in by expiration dates.
Prepping for a disaster is not camping.
Foodstuffs should be what you already eat, just keeping more on hand, and cycling through stock by date.
Water; in most cases, filter not store.
Think about how you will heat and cook without electricity.