But you can buy food with it in the grocery store in the corner.

For now. When paper money becomes worthless (maybe that's not so far off), the grocery owner might decide that nails, screws, alcohol, or even cryptocurrencies are more valuable than paper money.

I have known groceries in the past who were willing to accept means of payment other than government-imposed paper money because of the uncertainty of government money.

Especially in this day and age, we would be well advised not to rely exclusively on things staying the way we know.

We grow our own fruits and vegetables here and exchange them regularly with our neighbors. This way we can be reasonably sure that this will work even in worse times and we can support each other when there is a lack of money for food or for food itself. Or when there is no grocery anymore. 😁