LESTER :
(re: urine sample) What is this?

RICKY:
Urine. I have to take a drug test every six months to make sure I'm clean.

LESTER :
Are you kidding? You just smoked with me last night.

RICKY :
It's not mine. One of my clients is a nurse in a pediatrician's office. I cut her a deal, she keeps me in clean piss.
_____________________

Also, the last sentence sounds like he is being soaked in clean piss. Any other way to express the same meaning?

Thanks!