I wish people like you took a look at human history before you advices people on how to survive the "doomsday". We've actually been through a lot of "doomsdays" in the past and yet your advice falls awful short of what successful survivors actually did.

Because a lot of the times going to your farmland cottage is the best option you have. Especially if you know basic farming, a range of macgyverisk skills and how to genuinely become friendly with anyone. (Pandemics, climate change disasters, local riots, social break downs).

Then you have a thing like war or civil war, where you're best option is fleeing to another country as early as possible. Both to get a head start on the other refugees but more importantly, fast enough to beat the eventual border wall.

Which is really the problem with your "guide". You need three things, knowing when to get out and when to hide. Knowing how to live without being dependent on scavaging/stored food/modern society. Knowing how to get along with other people.

If you're an oddball with a lot of guns, food and what not, people are going to murder you to take your shit or they are going to burn you on a pyre for being weird/unliked/different.