Avoid uncooked leafy vegetables, eg. in salads. Dry foods such as bread, and jellies or syrups are generally safe. Drinking water should be boiled. Bottled or canned beverages are safe. You can easily tell whether carbonated drinks have been freshly opened.
Ice is only as safe as the water it is made from.
Wash your hands with soap and water before eating or preparing food. A simple adage is 'cook it, peel it or forget it'. B. Treatment of Water 1. Boiling Boiling is the only absolutely reliable way to purify water. Boiling for 10 minutes at sea level will kill most organisms, while boiling for 20 minutes will also kill most parasites including Ascaris.