Personally I think the only really safe things to buy are food, gold, silver and land.
Land is good unless you think the government is going to collapse, then you need specific land that you can use for growing food, or that has animals on it you can hunt, and then you need to be able to defend it.
So I would think land that is out in the middle of nowhere, maybe in mountainous regions with narrow passages. Technology can actually provide you with local sources of energy, and energy can give you a pump for water, and satellite connections for communication if that doesn’t fail.
Food is always good, if you can get non-perishable stuff. Also, clothing and other consumables. Think about everything you would need money for over the next 10 years, and then just buy all that stuff now and store it. You lose if there is inflation, because you could have bought it later for less, but if you have what you need, what does it matter?
Gold is useful only if there is still a society and people are still enraptured by the fiction that gold is useful. You can’t actually do anything with it, so unless someone else also hoarded, and is stupid enough to trade a useful item for a useless lump of metal, having gold won’t help.
On the other hand, if the problem is simple inflation, and the society is still intact, gold is helpful if you can convince others that the inflation will continue, and hope that they don’t ask why then you are selling it for cash.