I don't think you can expect any outside assistance in a major disaster zone like that. I'm not expecting any assistance where I live in California ... not for weeks. I do not believe our Government has the capability to address a widespread disaster zone and get food or water to many of the people. So you need to aim for self-sufficiency and resourcefulness.

If you are going to leave ... it's whatever you can carry on your back, plus maybe if you still have good roads you can wheel stuff in a suitcase (with wheels) or a supermarket trolley.

Japan seems to have a well-developed system of shelters. Very impressive. Our own facilities in the USA will be over-run. Unless the conditions at a shelter were very good, I'd probably try making it on my own.

other Pete