Concentrated nutrients
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Bags of nuts, preferably unflavoured and unsalted (avoid excess salt) - check the expiry date is long
Also pnut butter
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Dried fruit e.g. dates
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Dark chocolate (70%+ cocoa) is pretty healthy in sensible amounts
< spoilsport alert > Don't waste storage space on junk food like crisps, sweet biscuits, choc with < 70% cocoa content.
Anyway, they have a half-life like hard radiation, so are likely
Tinned veg, beans, fruit
Tinned fish (in brine, not dubious cheap veg oil) - tuna, salmon, sardines - fish is v healthy
Staples:
Porridge oats, brown rice, pasta, crackers, jam
Essential toiletries:
tooth-paste, spare tooth brush, deodorant, soap, shampoo
In case of water / clean water supply issues:
Wet wipes, wet toilet wipes, face wipes, at least 6 litres of bottled still water per person
In case of power cuts / power rationing:
Microwaveable rice / pasta, instant porridge, pot noodles
Also candles, matches, torches, portable electric heater (if space)
BATTERIES
Basic 1st aid:
Include umpteen plasters, a big roll of plaster, a few bandage rolls, germolene, aspirins, basic book