Use Quick Fix 4.0
http://www.detoxforless.com/pass-a-d.../fake-pee.html
I have done 3 test on the QF 4.0 and passed all 3. 
1. was a home test kit (passed) 
2. I sent the sample to the test kits lab.(Passed) 
3. Took a pre employment SAP 5-50 W/NIT Test. (Passed) 
I also saved the empty bottles for Temp.Testing. 
Heres what I did and my results. 
First I filled the QF bottle with cold tap water then took the heating pad and taped it to the side of the bottle without the temp. strip. 
Put it under my nuts and in about 1 hour it was @ 92 degrees.As time went on the heating pad made it warmer till it peaked at 98-100 degrees. 
It held this temp for 10 hours.*Note: The heating pads get to peak temp in 2-3 hours.