a copy of your birth certificate, shot records if required, and passport printed on waterproof paper in a money belt(this will get you past the nice Marine guarding the consulate)....

contact numbers with the US embassy/consulate
quality LED headlight/batteries with center head strap
quality LED flashlight/batteries for EDC
multitool or small SAK
whistle
compass
water bottle/water purification... Aquamira/Katadyn filters as stated by Ajax or tablets/clorox
chem lights or candle lantern for hotel
small door wedge for hotel
lap top or small portable radio for information
inexpensive cell phone and watch
"throw away" wallet with out of service credit card and minimum amount of money
waterproof map with location of your hotel, US consulate and airport
couple of MRE entrees in case you get stranded at an airport

prescription meds and OTC advil/tylenol/immodium/antacid, 4x4 pads, roll Kerlix, roll cling tape, topical antiseptic (iodine can be used to purify water) cloth band aids, tweezers, couple sheets of paper towels for emergency TP..hand sanitizer

brimmed hat/sunscreen/long sleeved caped nylon shirt/sunglasses/TEVA style sandals to allow your feet to dry