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Tap water safety usually comes down to how a country treats and delivers water, not just its overall wealth — several Caribbean and Gulf destinations rely on modern desalination and have very safe tap water, while some popular destinations with otherwise excellent infrastructure still recommend bottled water due to older pipe networks.
When in doubt, extend the same caution to ice cubes in drinks — they're easy to overlook but carry the same risk as the tap water they're made from.
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