I think any emergency kit is going to depend on what's possible. Here on the farm I filled an old chest freezer in a building separate from the house with everything I could think of, the usual tinned food, batteries, etc., but also extra clothing for all weather, a tent and air mattress, sleeping bags, medical supplies including prescription painkillers, just about everything you might take along on a prolonged camping holiday. Also battery radios to keep up with the news. I assumed a major quake or storm that cuts us off, plus an electrical fire that burns down the house. We have everything necessary to camp outdoors until help comes, including different sources of water. I realise inner city dwellers won't be able to do this.