Get some body elses urine, put it in a small leak proof container and keep it as close to your body as possible for 10-15 minutes before test. Accomplish this by wearing tight underwear and tucking it up there
Or go to the head shop and purchase the synthetic urine. It comes with a container and heating pads. Follow instructions and you will be cool.
Otherwise randoms are just that. If they catch you unprepared then you are toast. Just keep urine readily available in your car and you should be cool:thumbsup:

PS thats why i like working for myself!!