Admiral Patrick[Shitty Daystrom] Have we ever seen a 23rd century toilet, and how would it function?
gregorumWe saw one in Star Trek V when Kirk, Spock, and bones are put in the brig of the enterprise – a. Kirk pushes a button and it slides out and he sits on it. But the lid is down, and thankfully, he doesn’t use it. It kind of looks like a normal toilet. That’s all we know. 
Davel23To be fair (and pedantic) that is a 23rd century toilet.
I commented before OP edited his title and post. Originally, he was asking about a 23rd century toilet.