Having taken my kids from the ages of 6 mths we have been all over Asia. Simple rules are don't eat salad, avoid meat as their refrigeration methods don't really exist. I take the the Colloidal Silver maker with me with the wrist attachments and if any of us feel average we strap it on and give ourselves a zap. Only use bottled water for teeth is great advice. Common sense is alwaysgood. Water purification tablets are helpful. A friend always uses travellan I haven't. Any change in food can cause stomach trouble, we Sie slippery elm in a paste if any of us get the trots!! Diatomaceous earth the whole trip will help. People don't even travel and they have massive parasite burdens! I reckon I get sick on the plane ride home. Stuck in aircon with randoms from all over the world is a melting pot of all sorts of sickness. He will have an excellent time. Plus vitamin c. Hope this helps.