Report your lost or stolen passport to the local police and the nearest U.S. consulate or embassy. Ask a policeman to direct you if you do not have the necessary addresses and phone numbers, or obtain this information online by visiting usembassy.gov.
Contact the nearest U.S. consulate or embassy and ask for the American Citizens Services unit. Tell them your planned date of departure so they can assist you as efficiently as possible. Often, they can usher you through the process of obtaining a new passport in just 24 hours.
Fill out a new passport application. Use a photocopy of your old passport identification page to prove your citizenship and identity.