If you live by seashore, probably the best thing to do is just run. Run to the higher place, upper hill, the top of the building.
It seems like this Tsunami hit those missing people within 10 minutes after the quake. In Iwate prefecture or Miyagi prefecture,
the waves were more than 10 meters and even 3rd floor or 4th floor were not high enough. I don't mean to scare you, just in case, wanted you to know the fact and hope you will not face this kind of incidents.
Let me write about this kit now. If you have this, it might help you in some ways or help some others around you.
instant / readymade packed food/ canned food/ sea biscuit /chocolate or candy bars
2) Drinkable Water
for 3 days supply. I have 2 big bottles and 2 small bottles
for toilet use etc. I am using fruit liquor bottle. 1 big one and 2 small ones.
This is not something you can carry, but if you are stuck at home and water supply was stopped, you can use this.
4) Medical Goods
antiseptic substance/ vulnerary/ gastrointestinal drug / cold med/ surgical cotton/ band-aid/cotton gauze
your daily medication / eye glasses or contact lenses
tissue/flashlight/dry-cell batteries / radio / back up batteries / can opener /paper or aluminum plates /plastic wrap ( if you place this on plates, you don't have to wash plates )/chop sticks or spoon and folks / knife/ lighter / mobile phone and its
back up batteries/ sanitary goods / portable body warmer ( usually sold in package ) / towels / portable toilet or disposable toilet bag / garbage bag
cash / stamp ( in japan instead of signature, name stamp is required ) / bank book / powdered milk or formula ( if you are with babies) +baby bottle
hat or helmet ( actually, i need to buy one hard helmet ) / blanket/ underwear / sweater or sports jacket/ work gloves
If you can put a pair of shoes by the bed, it's better to have one.
portable gas stove ( you can't carry this with you, but when all the infrastructure was cut off, this will help. )
oil marker / pen ( to leave message etc.)
I have one light emergency kit and another for clothes etc. When you are running, you can't probably carry all these, so in that case, you can come back later if your home is safe or if you survived, so don't bring too much. If your place is on fire, or tsunami is coming, your life is the most important thing.
Also, if you have family and relatives, I would suggest to discuss ways of emergency communication. Nowadays, Facebook, Telecom Companies offer these services / finding missing people.
Hope it helps. Hope you don't have to use this, but by having this, you might feel better.