Drink the readily available bottled water. Buko (young coconut) juice is also safe if they have not added local ice to it. Be wary also of Buko juice vendors, some usually just add sugar to water. Buy and eat fruit that has not already been cut up. Cooked food from a karenderia (outdoor canteen) is okay if there is a fire under the pots and the food has been kept hot. If you must drink tap water (it is usually served/contained in a small to medium plastic bag), water in Manila, Cebu City and other major cities, but it is recommended that you boil tap water for at least 5 minutes just to be safe. Elsewhere drink bottled water. There is always the risk of contracting amoebiasis when drinking tap water in the countryside. Also, this applies to ice that is usually put in beverages. Bottled water is best purchased from within stores and sheltered eateries. Bottled waters sold outside (by the roads) are more than likely used bottles filled with tap water, sealed then cooled.
Be careful of drinking pampalamig (cold drinks like Sago't Gulaman) as some of the vendors might be using Magic Sugar(formally called Sodium Cyclamate); an artificial sweetener, which has been banned by the Philippine Government because of its adverse effects on health such as higher risk of getting cancer by consuming Magic sugar, it has been used as an alternative to ordinary sugar as it is much cheaper, call 117 (Philippine National Police) if you encounter such situation.
Streetfood isn't so safe to consume in the Philippines, hygienic standards aren't enforced much. It is better to eat streetfood as well as pampalamig inside malls and shopping centers than in streets as stalls in malls and shopping centers have better enforcement of cleanliness.
CDC advises that risk of malaria exists in areas below 600 meters, except for the provinces of Aklan, Bilaran, Bohol, Camiguin, Capiz, Catanduanes, Cebu, Guimaras, Iloilo, Leyte, Masbate, northern Samar, Siquijor, and Metro Manila. Chloroquine is no longer a recommended malaria preventative for anywhere in the Philippines. In general malaria is not common in the Philippines compared to Africa and the rest of mainland Southeast Asia, and around half of the c. 40,000 annual cases are in a couple of discrete locations. Dengue fever is common in the Philippines and cases rise every year, so it is advisable to apply anti-mosquito repellents and wear long sleeved clothes whenever possible. Rabies is also common among street animals in the country, so get a vaccination for rabies if you haven't already, and if you're traveling with children, vaccinate them as soon as possible as they are of high risk of getting rabies because they tend to play more with animals. Hepatitis A and B is a high risk in the country. Get a vaccine if you haven't had one, as you can contract hepatitis through exposure to contaminated food or water, sexual contact, or contact with blood of infected people. If you plan to visit rural farming areas, Japanese encephalitis is common, and vaccination is recommended. Avoid swimming in fresh water areas where you will have high risks of getting schistosomiasis (unless they are chlorinated). Leptospirosis is often contracted from recreational water activities, such as kayaking, in contaminated water.
Also please note that tuberculosis is very common in the countryside, so try to avoid individuals who cough or look weak and be careful about staying too long in villages that may be high in contagious people.
Bring anti-diarrheal drugs with you, as unsanitary conditions present a high risk for traveler's diarrhea. Gatorade or other "sport drinks" might relieve you from fluid loss. Drink bottled liquids if you are unsure of the water, and always wash your hands.
Although the Philippines is a low HIV prevalence country, it still pays to take precautions. Other sexually transmitted diseases are more common than HIV.
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