That’s great that you have chosen Turkey. I would just say bottled water. I actually have drank some of the tap water, and I’ve been ok, but I try not to make a habit of it. I would just say don’t eat meat from the street vendors. Also, I would ask your son’s physician b/f you go about any vaccinations he/she would recommend. I had a few, but I don’t know what they recommend for children under 12. You might want to ask your doctor about taking an antibiotic (sipro) for travel diarrhea with you. That is what the embassy doctor recommended to my group. Hope you have a wonderful and safe trip!!