People will appreciate your efforts and it will make establishing friendships that much easier. The water leaving the purification facilities of Puerto Vallarta has been certified for over five years as among the best in all of Latin America. However, the city's piping is old, so it's best not to drink the tap water. Purified water is available in all hotels, bars and restaurants, which all use purified ice as well. It's advisable to drink at least 4-5 glasses of purified water a day to help prevent dehydration.
Bottled water is sold in most stores.
Some hotels and villas filter their water, so you might want to check. Food Food service quality has greatly improved in Puerto Vallarta in recent years. As an added precaution, you may want to avoid salads and peel all fruits and vegetables or at least wash them well. Use the lemons served in restaurants, as the juice has antibacterial properties. It's possible you may eat or drink something that isn't quite right while on vacation.