Sangria is just as common in Portugal as it is in Spain and is especially easy to find during Lisbon’s famous Festas Populaires, the combined saints days and summer solstice celebrations that take place every year. During the festas, sardines are grilled on barbecues set out on the streets, and pop-up bars serve beers and paper cups full of fruit and red sangria.
Most of the sangria I drank in Portugal (for research purposes, of course) was made with sweet lemonade or orange soda, rather than the more old-school soda water. If you prefer soda water, simply replace the orange or lemonade with 450 ml soda water instead. I’m not sure how traditional it is to add orange liqueur, but it is really delicious.