OP, what timescale are you prepping for? And what scope of disruption… ie just domestic properties in your area, or affecting infrastructure services like sewage/pumping stations/mobile phone masts/supermarkets etc. What sort of property do you live in, ie flat, house with small garden, house with large garden?
It’s relatively easy to cope with domestic power loss for a few hours/couple of days.
Power banks for phones/small devices.
Small fold out solar panel for charging phones/power banks.
Battery powered lanterns/torches.
Hand cranked radio.
Board games/cards etc for entertainment.
Supply of candles AND safe holders for them and fire blanket/extinguisher.
Keep the freezer full at all times. Use old milk bottles, filled 75% with water to fill any empty spaces as needed.
Minimise opening/closing of fridge/freezer.
All food will be fine with powerloss up to 12 hours. After that, begin to use your discretion. Things like icecream, frozen mince, kievs, rice dishes will begin to defrost, whereas joints of meat will be fine for a good 24 hours +. We lost power for around 20 hours over the heatwave this year and the freezer stuff was fine.
Get a non-electric kettle to go on the hob.
If you don’t have a gas hob, get a camping stove/kelly kettle (USE OUTSIDE!)
Go somewhere like the pub/library for a couple of hours
Longer term/deeper infrastructural disruption. Look into homesteading options/people living off grid.
Emma Orbach (some youtube interviews and featured in a Ben Fogle documentary a couple of years ago) - she lives in a hobbit house in Wales, totally off grid, bar a landline in a hut in the next field. Self sufficient in food (veg, goats milk & eggs), bar the occasional trip to town for chocolate/rice/coffee.
Rob Greenfield (youtuber) - lived in a tiny house in San Diego. Had a rainwater purification system & Berkey filter. Bathed in the ocean. Grew his own veg. Had composting toilet. Cycled everywhere (including across the whole continent to New York!) Now living in FL in another tiny house and foraging for food.
Lots of books about homesteading/self-sufficiency/off grid living eg John Seymour, Nick Rosen.
Laundry - get some oldfashioned laundry kit, either from Amish/offgrid type suppliers in the States like Lehman’s/Columbus or your local reclamation yard or Gumtree/Ebay. Key items are a posser for agitating, galvanised buckets (or brewing/builders’ buckets), a washboard and mangle. Get hold of laundry soap bars. Watch youtube for tips and tutorials.
Heating - wood burning stove/range. Keep stocked up with logs.
Water - short term - Lifestraw, Berkey filter. Long term, install a hand pump in the garden.
Cooking - have supplies of stuff that require simple rehydrating (eg couscous dishes) or tins like baked beans/Irish stew that just need heating through.