No. While water treatment, filtration, and purification have greatly improved in Mexico, the consensus among travel professionals and the Centers for Disease Control is that it is still not a good idea to drink ordinary tap water during your visit. Sanitation standards are different from what you are normally used to, and that’s why traveler’s tummy and diarrhea is a risk. Exposure to bacteria, viruses, or parasites that might remain in the water can cause gastrointestinal upset and could ruin your Mexico vacation.