Using real piss for sub method

If I can't get and fake piss I'm forced to use my little bro's piss. I've done the substitution method before and got it down (Fuck my balls were on fire!) I know you can freeze the piss to make it last, my question is, how long will the piss last if I freeze it, then thaw it out? I'm pretty sure I'll be tested first thing in the morning.

I know that real urine starts to breakdown after eight hours in the fridge don't know about freezing it I have had my dad pee for me and stored it overnight in the fridge and did'nt have any problems passed my ua with it. good luck hope this helps