Would it be better to "crotch" the QF bottle or use the heat pad or both? I will be taking a test next week and will be going straight from work to the hospital just blocks away. No microwave access. I have had the test there before and they take the sample and test the temp right away.

So, should I just crotch the bottle a few hours before the test and keep it there until I take the test?

Or should I use the heat pad and put it on the bottle about 2 hours ahead of time?

I am worried about the temp because I know they take the temp right away. I just want to know what provides the most constant 95 - 100 degree temp?