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Cuba is considered very healthy except for the water; even many Cubans boil their water. That said, some travelers drink untreated water without ill effect. The best solution is bottled water and lots of it, especially for visitors who are not used to the 30+°C/85+°F temperatures. Bottled water (agua de botella) is easily found and costs between .65 and 2 CUC for a 1.5L bottle, depending on the shop. It should be noted that the mineral count (total dissolved solids) of bottled water is quite high compared to elsewhere in the world, so if you are planning to visit Cuba for an extended period of time (e.g. as a student or on work permit), it might be a useful idea to bring a small jug/sports bottle water filter with a few cartridges along to further purify the water.
Cuban milk is usually unpasteurized, and can make visitors sick. Additionally, tourists should be wary of vegetables washed in tap water. Despite the warnings, most Cuban food is safe to eat and you do not need to be paranoid.