So why are you asking us? Permission? Validation? Most establishments say no outside food/product to be consumed as they want to gouge you the mark up for pop. But there are always going to be those who bend the rules. I say stop drinking so much pop. The body is not meant to consume the chemicals. Try drinking water, buddy. It's a big change but worth it in the long run.If it's a food court, they won't care or even notice. If they have their own premises, I still don't think they will care because it's not a restaurant.
Klute