The small squirt bottle sounds like the best method I can think of to smuggle it into the test, however it would be ideal if you had a bag with a squirt bottle head on it, so that it wouldn't be rigid.
From past experiences with urine tests, it seems like they needed between 6-8 fl. oz. of...
At the moderators advice, I won't post pics of the car (Even though I really want to!).
I have a 2004 Pontiac GTO, 6 speed, it's silver with black interior.
It makes 385whp/371 wtq after doing heads, cam, headers, intake, and some other things.