i try to not stand out as a typical fat guy who simply cant pass up a free buffet (and that boils down to my own psychosis and maybe not as much a professional requirement)....and continue to bring my own water so that no guest wonders if im attempting to get loaded on free booze after my 3rd trip for a diet coke...
Dude, stop worrying so much about what people think! You are working for a client. If the client allows you to get a drink of water, what's the problem.
Do you realize how absurd you sound? People, including me, aren't mad or upset, they just think that not eating or drinking at a wedding when you are invited to do so by the people who hired you is crazy. You HONESTLY think that people are judging you because you went to the buffet? Give humanity a break. They don't give a damn what you are eating or drinking. They just want you to make them dance.
Geesh!