spend a day collecting piss into the biggest bottle in the house [if by the end of the day its not full fill the rest with water] then take it into a park or nature trail. strip naked other shoes and start drinking but your only allowed through a straw. once your half done stuff as many of your clothes in the bottle as you can prioritize the soft more flexible clothes like underwear and socks then drink up as much as you can squeeze out with that poor little straw. if you need to pee before you finish thats fine
you do need to pee in the bottle though. then once its nice and empty you can put your clothes back on and find somewhere to recycle that bottle
my three limits are: proof [pics and vids etc], illegal, scat