Call this one prepping lite but it will get you through a few days to a week in good comfort. Power loss in our area is common from weather and over the years we've found how a few select pieces are critical. They are also inexpensive and most readily available used from craigslist, offerup, letgo, flea markets, and yard sales. Further, all except the fuel fits in one large tote. Please add anything you think would be useful.
(1) Propane camp stove. I got my Coleman for $5 (yard sale) and it looked barely fired. Takes up little space and can be used inside. You can cook full and elaborate meals with one and heat adjustability is excellent.
(2) Propane area heater. Many out there, go by reviews. We have a Mr. Heater one as well as a Coleman Catalytic. Test them and see how quickly they run through a cylinder, some are worse than others.
(3) CO detector. So far ours has never gone off when using any of the propane gear inside.
(4) 17 oz. disposable propane cylinders. One cylinder will last 4-5 hours or more at low output, about half that if on high when used on the stove. Keep in mind these disappear during a blackout very quickly so have them on hand. I keep ~12 or more on hand.
(optional) 20 lb. propane cylinder with hose to run stove. Gas grill cylinders are always around during a blackout. Having the means to use them with your propane appliances is key. You'll need a hose adapter to disposable cylinder at the minimum.
(optional) disposable cylinder refill adapter. This lets you refill the small tanks off the 20 lb. one. Just bought an adapter, not tried it yet be reviews say they work great.
(5) Several oil lamps. All used and flea market / antique store buys. Cleaned them and added new wicks, ~$35 in all. Filled, they will run 6-8 hours and also give off a decent amount of heat which is nice in the winter.
(6) Lamp oil. I use Floralsense (Walmart) which has low smell. There are scentless ones but they are 3X price. Floralsense is $6/gal. A gallon will fill at least 6 antique oil lamp vessels.
(7) Large pack of tea light candles. Each one burns ~4 hours and provides enough light to see in a dark room. If you have an IKEA nearby they have huge bundles of these for ~$4/50.
(8) assortment of LED flashlights. Even batteries near dead will run most LED lights.
(9) large amount of rechargeable batteries for LED lights.
(10) ability to recharge them in car. (LiitoKala Engineer is a good one and charges battery than fits into it.)
(11) Phone powerbank(s) that can be recharged in car. Get ones that are at least 7000mAH or larger. One this size will recharge ~2X phones.
(12) 3kW generator or larger. We have a 3.5kW one and use it to cycle the refrigerator a few times a day. Have yet to have food spoil.
(13) gas for generator. All winter I have 10 gallons on rotation.
(14) Radio w/ AM/FM & ideally SW bands. Make sure battery needs are covered.