I honestly wouldn't recommend doing "anything" in particular as far as omitting water, skipping a meal until after weigh in, etc. If you weigh in each week at the same time, for instance, and let's say you weigh in at 10am-if you eat breakfast each time before WI-then your results are still going to be consistent, KWIM? Skipping a meal is just omitting the pound or few ounces of that meal or drink...but if you skip it for a weigh in...then you are going to have to start doing it every time for the results to be consistent-like if you skip breakfast for your weigh in this week-and you weigh 178, and the next time you eat before weigh in and you weigh 178-you could have actually lost a pound but not realized it-because you skipped a meal the first time and actually weighed 179. Did that totally confuse you?
The only thing I DO recommend is wearing similar clothing and going at the same time of the day. Don't wear a tank and shorts one day...and then a huge sweatshirt, sweatpants, and heavy boots time.
