Urine Analysis plan

[Burnt Toast]

So I take it your advice would be to sub?

Yep. Its your best bet if passing this test is important to you - so important that its not worth taking chances with your own urine.

If I did, how do I keep it on me and warm if they make me empty my pockets and everything?

You dont stash it in your pockets. Stash it as outlined in N2s Substitution sticky thread.