I have been keeping an eye on the disaster in Japan and reading about the things that have worked for them and the things that they are struggling with.
Some things that I noted were in instances where people worked together and shared resources, they were managing quite well. In other instances, not so well.
Some items I read about that people were struggling with were: fresh drinking water, clothing and adequate shelter for the season, keeping warm, transportation, medications such as regular prescription medications.
The following is a link that is very useful for general preparation. We all have similar basic needs such as water, shelter, clothing, food and we all different individual needs as in the case of young children, aged people, teenage appetites, prescription medications or pets.
Please take you personal circumstance into account when making your preparations.
http://bereadyutah.gov/