Eat only thoroughly cooked food or fruits and vegetables you have peeled yourself. If you are going to visit areas where there is risk for malaria, take your malaria prevention medication before, during, and after travel, as directed. To prevent fungal and parasitic infections, keep feet clean and dry, and do not go barefoot. Always use latex condoms to reduce the risk of HIV and other sexually transmitted diseases. Cook it, Peel it, or Forget it.
Salt water is usually safer.
This will help him to determine what infections you might have contracted. If those areas have been visited which were affected by malaria, dengue or some other disease, continue taking medicines for the prescribed period. It is essential that course of medicine be completed so that there is no risk of disease making you the host. At many place even ground is not fit for drinking. In some places the iron content is more at others water is salty or the sulphate content is more in a nut shell water is not safe to drink.