The bottle is necessary for space-time to continue inside it, so breaking the glass is no option. If the glass was broken, it would rebuild itself due to space-time laws
The only way to exit the bottle is through the neck. The neck is very small but there is no lid so it is easy to escape.
The bottle has beer inside of it but that is meaningless because it is a "space bottle", so the beer can evaporate or solidify, but it is always at the bottom due to the size change in the gas stage.