they saw you drinking water so it would make sense that your pee is lighter in color for the second time, which also means its more diluted. I don't think they can fail you based on color/dilution alone. The results just come back "Diluted" and its the company's discretion as to how to proceed. I learned this after speaking with someone from tech support at Quest today. You aren't supposed to know anything about creatine levels in piss, thats for the lab experts to care about. Its not your fault they made you drink a whole bunch more water to get another sample. You should be ok.

Help me:
http://boards.cannabis.com/drug-test...a-ok-am-i.html