I agree with all the tips about eating and drinking in a normal way. However I am not immune from disasters. Not so long ago I spilt a glass of red wine onto my apron. A big glass I should add! I was not in a position to take any sort of remedial action (sitting in an audience when movement would have been very inappropriate). My woollen kilt was dispatched to the dry cleaners and it came back as good as new! I still try to be careful but I do not worry so much!