Sort:  

only some will survive.. many will fail.
and it is not "A" stockmarket crash.. it will be the currency reset that will be referred to in history for centuries, much like "The Great Depression".

Is it also possible that in this fiat currency crash and stock market crash people may flee to digital currencies like bitcoin as a form of safety?

Cover your bases
barter trades will also work
medicines
tools
fuel
lighters
booze
how much will hand rolled tobacco be worth to someone who smokes?
Do not rely on one form of currency.