(Outside United States, Canada and Puerto Rico)
Any money the college gives you in advance of your trip is in U.S. dollars, and any money it reimburses you after the trip is also in U.S. dollars. You are responsible for exchanging those dollars for the currency of the foreign country you visit.
Keep track of the exchange rates as you travel. Complete your TRD when you return as you would for domestic travel and document the source for the exchange rates you used (e.g., Wall Street Journal).