water bottle; canteen; flask; thermos
A portable container for carrying drinks, typically water, tea, or other beverages. Can refer to a simple bottle, a vacuum-insulated flask, or a traditional canteen.
遠足に水筒を持っていく。
I take a water bottle on the school trip.
This thermos keeps drinks hot for a long time.
I poured barley tea into my water bottle and took it to school.
I always bring a water bottle when I go hiking.
I drank water from my bottle during the break.
Please wash the water bottle thoroughly after use.