If your Feeling Lucky You Could drop a 1/4 tab of ural into the pee jar.
you'll just have to wait for it to stop frothing before you hand it back..lol..
If your Truley Desperate.
Or find a Clean freind.
Bag the pee.
Keep it under your arm.(to keep it Pee warm).
then drop it in the Jar...

Feeelin Lucky...