There are a few things to consider when deciding whether or not to bring a reusable water bottle with you to Europe. The first is the climate. If you're visiting during the summer, it's going to be hot and you'll want easy access to water. However, if you're visiting during the winter, you may not need to drink as much water and can get by with carrying a small bottle or just refilling at cafes and restaurants.
Another thing to consider is the type of travel you're doing. If you're staying in one place for an extended period of time, it might be more convenient to have your own water bottle so that you don't have to keep buying single-use bottles. But if you're constantly on the move, lugging around a reusable bottle might not be worth it.
Finally, think about how much money you want to spend on bottled water. In Europe, bottled water is often very expensive (especially in touristy areas) and the quality isn't always that great. If saving money is a priority, then bringing your own reusable bottle makes sense.
So ultimately, there's no right or wrong answer when it comes to whether or not to bring a reusable water bottle with you on your trip to Europe. It all depends on your individual circumstances and preferences.