Canned meat can be stored a few dozen years. But I guess if that was a question, you should better care for the safety and preservation of your ammo...
Yes but you want a very
value-dense material, in the sense of most value / less volume (m^3)
So the best thing for that is
diamonds, not gold. Diamonds have the most value / less volume, so i dont understand
why you go with gold.
Unlike diamonds, gold is divisible, and, what is more important, gold is
standardized, that is, a given bullion of some purity is not much different than other such bullion of the same purity. There are no two diamonds that are identical and valued
identically, hence raises the difficulty in assessing the value of a certain diamond...
In short, no one will care for diamonds when canned beans become the staple of one's diet
Diamonds and precious stones in general are a poor investment.
Diamonds are controlled by a monopoly - DaBeers, they are not particularly scarce just the supply is controlled. They can also be recreated to perfection in a lab which DaBeers is currently having a nose bleed over and trying to paper over with propaganda.
Perhaps but if you think the diamons are a conspiracy, then what about gold?
The same can be true with gold too. How do you know there isnt 50.000 tons of gold hidden in some vault, that was put there in the medieval ages.
For example the Aztec and Mayan gold, they got one of the biggest gold empires back then, how do you know some elites dont keep that gold secret and hidden just to manipulate the price.
Or the medieval gold gathered from the crusades from the middle east? How about the roman gold, they had pretty big gold reserves aswell.
What about El Dorado gold? The legend says that there are entire cities underground covered with gold

Or do you believe that the CB around the world are so honest that they will account the gold available to them by every gram?
With bitcoin you know for a fact, that there will be only 20999999.9769 bitcoins out there (maximum global supply ever), not a single bit more 