Every ounce of the server's ability to deny and deadpan will be required.
The "large" sizes at McD's are practically two liters anyway. I doubt that bottle will last long.
When normal customers "find your behavior odd," the worst they'll do is not tip you. But when your customers are cops, they'll go through your surveillance feed. Lesson learned.
I guess the horrible interference wasn't the crappy intercom system's fault this time.