Drink beer and soda pop. Avoid drinks with ice cubes. Do not brush your teeth in tap water. And alcohol does not kill infectious agents. Do not swim in fresh water.
Chlorinated pools are OK, and typically so is the ocean.
If your destination demands that you take malaria pills once a week, take them. If not, see a doctor. Be wary of drugs sold in foreign pharmacies. They often are allowed to sell drugs not available in the United States. They could be dangerous if you have an existing health problem or if they react negatively to another drug you are taking.