Keep in mind the following things are prepping without being seen as a lunatic who is prepping:
solar phone charger - just common sense at this time of year and always handy to have in your bag/car anyway
solar garden lights. In the spring summer and autumn these will charge all day for free and can then be brought inside in the evenings for light
candles - loads of candles just makes you look like any other middle aged woman
matches - see candles above
waterbutts - save the planet and reduce your water bills so why wouldn’t you?
drinking water - keep in mind this means fluid and so includes juices, soft drinks, milk, alcohol - you don’t need a mountain of bottled water.
radio - solar radio can just live on your kitchen window ledge. They cost less than a tenner
food - if we all planted a few things in amongst the flowers in our gardens we would cut our food bills and help save the planet - it’s a win win. Even a sunny bedroom window sill can be used to grow things. A week long stash of food doesn’t take up much space and if you buy sensibly it will last for a very long time. Jams, pasta sauces pasta cous cous and rice plus anything tinned will basically last a good couple of years. a bottle of oil and some flour also lasts ages. Bags of soya mince are really cheap and are a meat substitute that will last years. Sugar and honey will literally outlive you.
cash - put it in your knicker drawer and forget about it and then it’s a nice surprise when you find it in five years when rummaging for some tights without holes in the toe
There are loads more. Just be sensible and realistic about the state of the world