Greece: tap water is safe to drink.
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Tap water is generally safe in major cities and Athens; on some smaller islands, bottled water is more commonly used due to local infrastructure — check locally.
Yes — since tap water is safe in Greece, ice made from it is generally fine too.
Brushing your teeth with tap water is usually fine even where drinking it isn't recommended, but if you want to be extra cautious in Greece, use bottled water for that too.
Sealed bottled water from a reputable brand is widely available and the simplest safe option in Greece — just check the seal is intact before drinking.
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