Question about subbing

Alright so I have decided to go the subbing route. It seems the most obvious way to get it done right the first time. I have a friend that will pee for me. I bought a 3oz empty bottle from a store and some hand heating pads. I have been walking around with it stashed right in my taint. Its really not to bad other than when I get up from sitting down it has kind of shifted but not noticable at all. This is a random test that my company just started to do so there is a chance that I don't drop this week, we only do so many a quarter and this is the first quarter of the year. I just want to be prepared for the worst obviously. So I plan on having my friend piss for me wrapping the heating pad around bottle and stuffing it where the sun doesn't shine. My only problem is the temp, I don't have a real way to check the tempature other than it won't be very long from the time that he pees until the time that I am in the bathroom pouring it in the cup. It will be provided heat from the warming pad and my body temp. Is there anything that I can do in order to make sure the temp is accurate when I do hand them my piss? Any help is appreciated. Thanks

I would recommend getting a cheap digital thermometer.
If you immediately take the urine and put it in your crotch against the skin you should be good for a couple hours. But without a thermometer you'd be guessing.

The other thing to think about is real human urine goes bad after 8hrs or so. You should think about getting some synthetic urine, as it can be heated and cooled repeatedly.

this sounds a bit crude but im desprate QF is absolutly out of the question would take two days to get here test the morning or second day but anyways if i got some one to pee in lets say a condom put it to my skin (crotch area) it should be in the right temo zone for a hour or two??...i know its a bit gross but hey the money ill be making its worth it (didnt stop ealier cuz it was a last minute kinda thing)