Start by collecting your own urine. When you are proficient at that, ask your friends and family if you can collect theirs.
Then move on to acquaintances and neighbors.
Then ask random people (a mall food court is a good place to set up shop).
After about 10000 hours 'practice' (according to Malcolm Gladwell) you should be ready.
At this point, if you read a copy of "The Secret" you will get lots of mad tips on how to visualize your dream into reality.
Then bingo-bango-bongo, before you know it, you are living the dream.
You're welcome!
Now get in there and fill that jar with piss: time and tide wait for no man.