Czech Republic: tap water is safe to drink.
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Tap water is safe to drink throughout the Czech Republic.
Yes — since tap water is safe in Czech Republic, 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 Czech Republic, use bottled water for that too.
Sealed bottled water from a reputable brand is widely available and the simplest safe option in Czech Republic — just check the seal is intact before drinking.
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