Gold, silver, land...something real will carry value over from one economic tender to the next. Paper is paper, when one bill is no longer good it's only use, one poorly suited for, is toilet paper. You definitely need food and other items to get you through turmoil, but to carry value from one side to another side you need something other than food, meds, etc....there will be another day and when it comes you want to have carried your sweat equity across the divide into the new economic pay system. Except in case of two or three EMP events; you will need enough food, water and meds for a year to make it across....but, eventually the gold and silver will have value again and especially for international trade after an EMP event as there won't be nearly so many of us left around after one.
Gold...get silver. 1964 and earlier ninety percent US coins. A couple of silver dimes have enough value so that they will still buy a loaf of bread like they used to when I was a child. Silver coins are recognizable, gold not so much. Also...if you are going to buy a couple of bags of groceries how are you going to make change...another reason for lesser value that silver provides. Some gold yes, but silver for day to day. All fiat currencies that have been around a while have fallen.
In Austria right after WWII to get it's currency under control, the government announced that for every 1200 or so marks each man woman and child could redeem those marks for 100 new marks. So, a family of 5 new on Monday or thereabouts had to go the bank on Thursday only to exchange money, Friday was too late. So, those 5 family members brought in 6,000 marks and got 500 new more valueable marks for them. Only problem, the people who had 10,000 or 100,000 or 1,000,000 or more marks still were only able to exchange 1200 for 100. Period. This example is similar to other historical currency exchanges and there is no reason to doubt history will repeat itself since all the same old mistakes are being made so obviously the same medicine will be applied. Wealth confiscation by the government to offset political greed and stupidity.
Paper currency is cheap and easy to call back. but even the current coinage will have more value in another economic tender system. Number in accounts and paper are easy for the governments to confiscate and change over...coins are too hard to handle and to costly to reproduce cheaply and easily for an "overnight" exchange like in Austria...far too much effort. Coins go over, and I have not seen an exception, at par value. That is to say in Austria that family that had 500 marks after turning in 6,000 marks would have been smart to have bee keeping their change and turning their marks into change for the months leading up to the swap...6,000 in coinage in marks would have been worth 6,000 of the new marks in the new economic tender, ergo they kept it's value.