Dillution should work combined with time and abstinence but you will increase your chances dramatically by following the dillution sticky including ingesting creatine 2-3 days prior to your UA and sub gatorade or other sport drinks for water to help with specific gravity tests. Also for dillution to work you must abstain from smoking, the longer the better. Buy some test strips or at home kits if you are pressed for time and practice dillution. Its the only way to be sure.