We have done exactly as you say. We took money from investment profits and bought cases of canned goods, big bags of flour, sugar and brown rice. We bought what we normally consume.
We have very good cost records and are treating it as an investment rather than emergency stock. Given the anticipated inflation, the investment yield should be significant. It is portfolio allocation diversification
Be careful with the brown rice and long term storage. It has a tendency to go rancid where as white rice, packed correctly can last 25 years or longer :)
Just a tip from a long time prepper!