>>510764315
kinda depends how bad it gets. might not even be survivable at all.
but the general rules are:
>get away from large bodys of water as they could slosh around a lot due to volcanoes, earthquakes, changes in the earths rotation etc.
>have a cave/bunker/underground hiding location
>have supplies for a couple months
>learn some survival skills

for the other cataclysmic aftereffects there is too much RNG involved to really plan for it.
also (((they))) expect that around 90% of the worlds population will be wiped out.