The creatine really should be taken about 48 hours before the test. Taking it the day of the test will do nothing. Drinking lots of water the day before the test will do nothing as long as you are properly hydrated. For the person that asked about creatine, it is something that helps keep your urine from showing you are dilute. Your body metabolized creatine to creatinine and they measure your creatinine clearance on some tests. You want it to be above 20 and you can add creatine to your body through creatine supplements or eating red meat 24-72 hours before the test. Best results come when consuming 48-72 hours before the test.