Most tourists know this rule, but it's a major one: Tend not to consume the faucet water. Faucet water is not Safe and sound to drink in Cancun, mainly because it's rampant with parasites and potentially fatal microorganisms, and non-locals are very liable to getting Unwell from non-filtered drinking water. https://cancun-trip-tips14691.ltfblog.com/30875844/rumored-buzz-on-cancun-trip-tips