Once met someone who’s father had before retiring had a large corner shop and she said their garage always had stock for the shop. It was always just tinned, canned and any other goods that had a long shelf life and didn’t require water to cook. Also all the canned drinks and bottled water were stored in the garage too before going to the shop.
A while after the end of the cold war her father admitted that he had a reason for doing this. It wasn’t as he’d told them that there wasn’t enough space for the stock at the shop. It was because in the event of the cold war turning hot, they’d have plenty to eat and drink. She actually admitted she hoped to die in a fireball rather than live through it, but had never told him that.
My Government job meant that it was possible that I might have had a place in the bunker opposite Basingstoke Station. On a course at the Home Defence College at Easingwold, I had the temerity to suggest that some officials might not turn up,preferring to be with their families; this prompted the tutor to have a dig at me later when he suggested that I might be one such. In the event of escalating tension, selected officials would report to a hotel in Newbury (close to the strategic targets of Aldermaston, Greenham Common and the
USAF▸ bomb depot at Welford) and then be bussed to Basingstoke.
There were fears that some might prefer to see out Armageddon with their families so, bizarrely, the Government said that some relatives might be allowed in to the bunker ("Bouches inutiles" - "Useless Mouths") and one guy nominated his grandmother.
Happily the world became a safer place

and the bunker was de-commissioned ...
My job meant working on a bunker and looking at the technology to keep it and the services it supported running in the event of nuclear war or social collapse but apparently I didn't get a place. I also had to sign various bits of paper before I was allowed in despite pointing out there was a Wikipedia page that was far more detailed than the handover I'd received.