Mail-in Prob - Urine testing - Looking for advice

Hello all, long time no talk. 
 
I will be as brief, yet thorough as possible, as time is of the essence. 
 
I am participating in a 3 month mail-in probation which is almost over, and I just got a call saying I need to go get a urine test and have them fax the results to my PO within 48 hours or I will get a violation. Naturally I acted non-chalant on the call, but inside started to freak out, as it's been literally 24 hours since my last toke. 
 
I am not a heavy smoker if you ask me, I once was, but lately went from 100% clean to smoking daily a bowl or 2 in the evenings, now and then more, now and then less. I am 30, a male, fit, I go to the gym 5 times a week and focus on cardio, and am about 155-160 lbs. 
 
My concerns are this: I want to consider using fake/evaporated/someone elses urine because I see no concievable way I can clean out in time.
 
Where do I go? Are there places I can get this done which alter the chances in my favor or are all walk in places the same? What I mean is, if I was to go to an actual PO office I know I would get observed, but in this case I am not so sure. If I knew it was practically a guarantee I won't be watched while peeing, I would invest in a whizzinator or be confident taking someone elses piss. If no one can give me enough confidence of that here, and I have about a day, then I am not sure what to do other than maybe gamble with the dilution/detox drink method, but again, I smoked last night, so my chances aren't as good as if I had quit for a week or more.
 
Thoughts!? 
 
 
Please help!

 

Someone please give me some feedback here, I have about 24 hours to make a move.

 

For what exactly? Detox drink? Dehydrated piss?