You may also want to take an over the counter remedy for minor stomach problems, such as Pepto-Bismol. Cooked foods and fruits that you peel yourself are safest. If you are cautious, you may prefer to stick with restaurants suggested by your tour leader. But if you are willing to explore, you can find much better food than that served in hotel dining rooms. Domestic and imported soft drinks and beer are available, as is imported bottled water.
Hotels normally provide bottles of boiled local water, which also is safe to drink.
Electric service can be erratic, and in Cambodia the service is 220 volts. If you can live without appliances or use battery-operated devices, do. Otherwise, carry a converter and ask your tour guide when you need to use it. National Geographic Magazine has carried several articles on Angkor, and a visit to a library with a good collection of Geographics before you go will enrich your trip. Bangkok bookstores also offer English-language guide books for countries throughout Southeast Asia.