At a minimum, a good framing hammer, hand saw or hacksaw, medium prybar, axe, shovel, vise grips, screwdrivers, fixed blade general purpose knife, small mechanics kit with wrenches, can of all-purpose lube, sturdy cordage (paracord or accessory line) and duct tape. Ensure you have an adequate wrench or similar tool that can shut off water and gas valves in and around your home.
After 9/11, my dad filled a duffel bag with some energy bars, a couple gallons of water, some penicillin, and a map. Amid scaremongering headlines about imminent anthrax and “dirty bomb” attacks in the city, he wanted to have some supplies on hand in case we needed to get out of Brooklyn fast. Were he to assemble such a bag today, he’d likely stumble on a number of companies promising a more wholesale brand of disaster preparedness: a box full of shelf-stable freeze-dried meals, to be revived from their dessicated state with the addition of boiled water.