The following site has extensive information on which electric plugs to use in which country.
You must take the correct plug with you. It is so much easier to find the plugs in the US and take them with you than waiting until you are in a foreign country.
Atlanta Luggage has an extension collection of plugs. They have always had what was needed for an SFOI trip. See their contact information below.
Leather & Luggage Depot
1151 Chattahoochee Ave
Atlanta, GA 30318
Mon – Sat: 10 – 6 EST
Sunday: 12:30 – 5 EST
Toll Free: 800-720-2928