“...freeze the rice and pasta for three days to kill any bugs or eggs, and then store it in a plastic container.”
I’m with you on everything else - but have never heard of putting the starches in my deep freezer for 3 days - makes sense though.
I do think a small amount of silver coins would be a good thing - not an investment; just as recognizable currency (well) after SHTF.
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It’s not supposed to be perfect, but it helps a whole lot, depending on how cold and how long you freeze it for. I have had bugs on rare occasions in rice/flour/pasta that had not been frozen, but never in something I froze, even when stored for over a year.