No amount of preparation can get you through a disaster alone. Creating a community of people with complementary skills can increase those chances.
When the water is rising or the wildfire is spreading, you will need to make crucial decisions with rapidly changing information. Every decision you make in a disaster comes down to two questions: Is it safe where we are now? Will we be safe if we try to evacuate?
More often than not, answering those questions means relying on the people around you.