Portugal

Tap water in Lisbon is treated to international standards and is safe to drink; carrying a reusable bottle is practical. If you're sensitive to taste or lingering chlorine, opt for bottled or filtered water.

Tap water in Porto is treated to meet EU standards and is safe for drinking and brushing teeth; many visitors drink it without issue. If you prefer better taste or have a sensitive stomach, buy bottled water or use a personal filter.