I can speak about the student section because I am there standing on the tarmac in front of it for every game. So let me address a couple of things I've seen in this thread...
1) Yes, shooter bottles are frequently thrown within the student section and from the section toward the field. They were thrown throughout the UCF game and have been at other games. They're usually small, plastic, and empty, which from my perspective makes them a nuisance more than a danger. But it remains true that they're not allowed in the stadium and can result in a penalty when thrown to the field.
2) Full or partially full water bottles, multiple of which were thrown beginning after the final touchdown and through the end of the game, are another level. I saw countless bottles thrown from the upper rows of the lower deck and, incredibly, from the upper deck. Some landed in the south end zone and, if the refs had chosen, could have been called for a penalty that would have helped UCF when they still had a chance to tie or win the game.
3) More importantly, some landed dangerously close to workers on the tarmac and sidelines, and some hit students who were in the lower parts of the section. When a full bottle from the upper deck lands on the concrete, it goes SPLAT and flattens out. Now imagine how much it must hurt when one of those full bottles hits someone on the head. I witnessed at least two students in the lower part of the section suffer this. One of them looked very shaken for several minutes afterward, though thankfully she seemed to have recovered later. I am sure many more were hit that I didn't witness.
But please...think about your fellow fans and the dedicated workers, coaches, and players on the field before you do something like throwing a full bottle of water from 100 feet up and making it a projectile.