I would think that malted barley, hops, and yeast would be important also.
/johnny
I was thinking about this ... we farmers have corn all over the place. My family might include corn tortillas instead of bread.
Like you, I think the malted barley is a good idea. Even better, however, is an inventory of good Scotch whisky. Here’s why. Its shelf life is longer than your life expectancy (and much longer than malt syrup or any food item) and its price only goes up. Don’t get me wrong: I think a reasonable amount of food prepping makes sense, but I don’t like freezed dried meals enough to make them part of my dietary routine. And, if you don’t rotate stock, food eventually expires. Good Scotch whisky can serve as a barter item if the SHTF, but it can be enjoyable even if it doesn’t. So building an inventory of Scotch is an investment that works either way.
Now, if can only persuade my wife with this argument ...