The main post office, or Correo, of Acapulco is located on the Costera near the Zocalo. Health problems sometimes affect visitors to Mexico. Information on health precautions can be obtained from local health departments or private doctors. It is wise to review your health insurance policy before you travel. There are short-term health insurance policies designed specifically to cover travel.
Most hotels offer purified water, but it is always advised to drink bottled water.
A good rule to follow is if you can't peel it or cook it, do not eat it. Diarrhea may benefit from antimicrobial treatment which may be prescribed or purchased over the counter. Travelers should consult a physician, rather than attempt self-medication, if the diarrhea is severe or persists several days. U.S. citizens visiting Mexico for no more than 72 hours and remaining within 25 kilometers of the border do not need a permit to enter. Those wishing to travel past the 25 kilometer border area of Mexico must be properly documented.