It is better to be prepared these days, with the ultra efficient, over paid MIW in charge. Nowadays, in my bag, when I work, 1 small torch light ( LED), one face mask, one disposable raincoat, one small bottle of medicate d oil, one eyemo, one strip of paracetamol & others.
At home, stock of instant mee, torch light ( big), mineral water by gallons, raincoats, ponchos, gas masks, candles ( plenty of them) matches, lighters...etc.
if possible one generator...( who knows?)...