Most holidaymakers know this rule, but it's a large a person: Usually do not consume the faucet water. Tap drinking water is not safe to consume in Cancun, since it's rampant with parasites and potentially lethal micro organism, and non-locals are extremely susceptible to finding Ill from non-filtered drinking water. https://cancun-trip-tips58146.bloggazza.com/30922488/cancun-trip-tips-fundamentals-explained