Cash at home, yes, but also PMs, food, ammo etc. There is no sure way the crash will manifest. Hedge in all directions. Have an escape plan.
And what kind of cash at home? Coins plus the lower denominations of FRNs might go at a premium due to the need to make change. So that a one dollar bill may only be worth 3 quarters or 7 dimes. Or 50$ bills might be such a hassle to deal with that they really go for $43 worth of coins and lower denominations.
All the above would be in a deflationary collapse where peoples bank deposits go pooft and use of credit cards goes way down. So how do you conduct every day transactions? I have charged small $2 purchases to credit cards many times