Roberticus

I have a drug test this coming friday and the last time I smoked was last friday.
I have smoked two fridays in a row but before that I hadn't smoked for a year (don't ask why I started again). I am around 5' 11" 135, so I do have a very high metabolism. I work out on mondays, wednesdays, and fridays. This week I will only work out on monday and wednesday before the test friday.

The drug tests used are cups with a thermometer on the side. The thermometer is a strip, so I don't think I have to worry about it being too high.

I have never substituted before but I was wondering if I can dilute very well before the test, and fill the cup till the thermometer changes colors to indicate correct temperature, and then finish it with the clean pee. Anyone have any idea? That would definitely get the temperature correct but will the clean pee even it out enough to where I don't test positive... and remember I will be diluting.. or should I just try to get the clean pee at a correct temperature? The past few days I have been eating low fat and drinking lots of water as well...

(sorry if this vioilates any posting rules.)