While it is generally acceptable to bring outside drinks into Starbucks, the company's policy on this can vary by location. Some Starbucks locations may prohibit outside drinks for safety or hygiene reasons, while others may allow it as long as the drink is in a sealed container. It's always a good idea to check with the specific Starbucks location beforehand to make sure you're not violating any rules. Additionally, it's important to be respectful of other customers and to clean up after yourself if you do bring outside drinks into the store.