I am afraid that no mater how much "Prepping" that you do it will only prolong the time you have. Eventually you will run out of supplies and then where will you be if it was a REAL TOTAL COLLAPSE OF THE SYSTEM. If it was a short term like from a natural disaster you could go weeks even a few months if you Prepped enough. If it was an event that shut down the worlds power grids -forget it! Nuclear War !! Even if you had the basic supplies to survive (bullets, traps, seeds, for a garden, knowledge) you would have to live out the hoards of gangs and the living Dead roaming the planet.
Governments would have their "Chariot and ARK" Programs in place for the wealthy & government officials to start back up the reproduction process of humanity. They would start back years after the collapse with genetics, frozen embryos, and deep hibernation of mental giants to bring back society. It is said that Joe Brandon, Mala Harris, Nancy Pelo icy, Mitch McConnel already had their brains put into deep freeze and there are just Surrogates acting in their place now.
So for all you that are interested, you are basically SOL if something big goes down.