I don’t care what bones other Christians have to pick with the Mormon religion, this philosophy is an excellent one. Rely on yourself because depending on other people to help you in disastrous times is extremely selfish. I don’t have a years supply of food but I am working on it, just having money isn’t always the way to go. Money can end up being worthless, food may not be available at any price. I would also advocate a years supply of ammo for what ever weapon of choice a person might own( a years supply could fluctuate quite a bit depending on who you are and what you do with the ammo)
My theory is you cannot have too much. Ammunition might become more valuable than money and you could store thousands of rounds in a small space.
You might be able to barter for items using popular ammunition that no amount of currency or coin would buy.
It might be a great idea to buy and store ammo even if you don't own a firearm in the particular caliber. Popular calibers are .22, .223, .38 Special, 9MM, .45 ACP, 7.62 x 39MM and the nearly universal 12 Gauge shotgun shells.