Question about substitution

The other night I spent hours on this board searching through stuff, not knowing which method we would use. We've now decided on going with substitution, and I can't spend the same amount of time searching through again. So, I'm sorry if this has already been answered!!

Husband is going with substitution with a rinsed out shampoo bottle, with 2 pairs of whitey tighties.

Question 1 -- I read somewhere here that he could fill up cup with his own urine and wait til it heats the cup, and pour it out and pour the "good" urine in. Is this for real, has it been confirmed? I wouldn't want to screw this up over someone that posted this that's not for real. How does the "good, cooler urine" not cool down the cup?

Which method do you recommend....this one, or the one where you heat the urine up to 105 degrees, and then put it in the underwear?

Thanks in advance for your help! This board is awesome!

Peeing in the sample cup, dumping it out, then pour in the sub takes too much time. Certainly more time than it is to pour in an already-heated sub. So if you want to avoid having the nurse banging on the bathroom door, you should get the sub sample up to temperature before entering the clinic.

Its also way too risky to preheat and dump the sample cup with your urine. Pouring in a cold sub in that preheated cup is not always going to get the sample temp within range on time. If you give the nurse a sample thats under-temp, the nurse will then have you submit another sample on the spot. This time under direct observation.