If you live in or travel to Portugal: It's generally safe and healthy to drink the public tap water across Portugal. Get a water filter such as TAPP 2 to improve the taste and reduce the risk of contaminants. Avoid plastic bottled water in Portugal as most plastic doesn't get properly recycled.
Do Portuguese restaurants serve tap water?
For those living in Portugal, the taste of the water can be vastly improved with a high quality water filter. When dining out, restaurants will offer bottled water, but it is OK to ask for free tap water.
Do you need to tip in restaurants in Portugal?
Similar to the rest of western Europe, Portugal does not have a strong “tipping culture,” and there are really no standards or rules regarding tipping. Throughout the country itself, the tipping practice may vary, depending on the region where you are traveling.