Yes, pop/alcohol/bottled water - no problem.
You'll want to bring it in your day bag and not in your luggage. If it breaks in your luggage you will have a real mess on your hands (and so may someone else as it leaks on their luggage).
If you board early, you won't be able to drop your day bag in your room until 1:30. So if I were going to bring a lot of beverages, I wouldn't board until 1:30 ... that day bag got heavy after two hours just with my book, clothes, swimsuit, camera, etc. Of course, you might be stronger (or bring a rolling carryon - saw some of those as day bags).