Bring a phrasebook and a dictionary to help you out with some tough spots. Frequent the restaurants with the bilingual menus to familiarize yourself with the names of the various local dishes. The food is amazingly inexpensive, plentiful, and delicious. The little 2 year old girl at a hotel I stayed at would feed me bits of hings she had dropped on the floor and put in my mouth with her dirty fingers. And I am still alive and in good health.
Alcohol is comparatively expensive.
Have a plan for when someone in your group gets ill with digestion, fever, diabetes, etc. Everything comes in a plastic bag - rice, omelettes, you name it. It might not be silly to bring one or two plastic takeout containers to bring home meals or leftovers. Take advantage of the duty free shops. Pepper spray or something might not be a bad idea for adventurous types poking around in the corners.