Technically yes, the tap water meets European safety standards. It comes mostly from desalination plants, which leaves it with a flat, slightly salty taste.
Most people buy bottled water because it tastes better and costs very little. Using tap water for brushing teeth, cooking and making coffee is completely fine.
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Some areas have harder water than others, which affects the taste. Hotels often provide bottled water for this reason.
If you’re sensitive to taste differences, stick with bottled for drinking and use tap for everything else.