I have a drug screen at quest diagnostics tomorrow and I've been reading a lot on the temperature. I have a pack of the hand warmers that you shake and it warms up. I however do not have a thermometer or a temperature strip. I plan to wrap my clear little bottle of sub urine with the warmers and stick the bottle in my panties. My concern is the temperature will not be between 90 and 100. Is any one confident ghat using the hand warmers will produce the correct temp for sub urine? If not any idea where I can get a temperature strip by tomorrow?