A bottle is a container, often made of glass, that gets narrower toward the top. You can choose to buy soda in cans or bottles.
Some people drink chocolate milk from a bottle, and others prefer to sip a bottle of beer. Babies drink from a bottle that's made of glass or plastic and topped with a nipple. To bottle something is to put or store it — usually a liquid or a gas — in bottles. Colloquially, someone "hits the bottle" when they drink too much alcohol. And if you keep your feelings to yourself, you can say you tend to "bottle things up."