Oh yes, you should get a hepatitis vaccine before you arrive in Asia (A B C) and bring Pepto Bismol tablets as they are lighter than the liquid formula. There is a lot of diarrhea here in the warm weather(now).
The hep. vaccine costs more than a hundred dollars in Korea. It is sometimes free in some Canadian provinces. Be careful though. Ask the doctor or nurse if it has any human blood proteins. It could carry AIDS or some other virus??? Vaccines have their dangers.