Where did they take a leak?
There were public urinals, set up and operated by the fullers, because urine was used to process wool. Emperor Vespasian, the builder of the Colosseum (he didn’t finish it, but his son did) implemented a tax on those, the story will turn up on FR once in a while, or in a web search. There were also crappers in the public baths.
Here’s some whiner whining about how bad they were:
https://www.theatlantic.com/health/archive/2016/01/ancient-roman-toilets-gross/423072/