Ditto Deb. I weigh in at lunch too, and always have about 48 oz of water before I get there - I always use the ladies' room too before I jump on the scale, but other than that, I stopped worring about how my food/water intake would effect my weigh-ins. I don't usually eat until after the weigh-in, but that just happens to be my normal schedule. I drive to the center, weigh-in, grab lunch, head back to my office.
Good luck and great job on the 4 lbs you've already lost!