In Luanda there are one or two good private clinics, but these are extremely expensive and require immediate payment. The water supply is unsafe to drink, visitors should avoid eating unpeeled fruit and vegetables and the milk is unpasteurised and should be boiled; alternatively use tinned milk reconstituted with purified water. Drinking water should be treated or bought in sealed bottles (avoid ice cubes in drinks) and care should be taken with hygiene and food, particularly street food.