Is cheap and widely available throughout the country. you shouldn't drink the tap water unless you have no other option, and it must either be filtered with a high quality filter and purifier or kept at a rolling boil for at least 10 minutes before consumption. recent tests on tap water have found it contaminated with the e-coli bacteria.
Locally produced banana-beer is also available at times, but questionably safe to drink. Traditionally, you will drink this out of a hollowed gourd. First drink the guests, who then pass it to the elders. In some parts of of Tanzania, fermented bamboo juice Pombe is the common tipple.
Passion fruit, mango, and orange juices are available in many restaurants, and excellent when the fruits are in season.