Its possible your home may be destroyed or may not be accessible due to damaged roads, debris, and other hazards. That leaves you with your EDC, most likely only whats in your pockets, and maybe your car kit. Vehicles should have enough water, food, and basic supplies to last a few days if possible. Don't assume you will have time to load up the car before heading out. And always keep your tank at least 1/2 full. Stash supplies at work if you can. You may end up sleeping and sheltering in your office, so some blankets or sleeping bags would be a good idea. There seems to be a shortage of blankets at shelters in Japan. And don't forget to pack a deck of cards.