Have you messed up on the liquid pre-op?
Well... if my surgeon was being picky about it I have messed up. Luckily for me he doesn't require the liquid diet, it is a suggestion. I have been sticking mainly to liquids, but so far (I'm ending day 3) I have had something solid each day. (sticking to protiens though).
Do the best that you can do...but try not to stress too much