Bringing a water bottle on a plane is a common question for #travelers, and the answer is yes, with some restrictions. You are allowed to bring an empty water bottle through security and fill it up once you pass the checkpoint. However, if the bottle is not empty, it will be confiscated. Additionally, any liquids in your carry-on baggage must be in containers no larger than 3.4 ounces (100 milliliters). You can also purchase water after passing security, but prices may be higher than normal. It's important to stay hydrated during a flight, so bringing a water bottle can be a convenient and cost-effective option.