Here's a thought I just had while showering: the original showers were actually waterfalls!
Oh why do you you think that?
It's just historical fact! But there's evidence that early (rich) Egyptians had indoor shower rooms.
I see so do they also have indoor toilet?
It's possible, because they did have rudimentary drainage systems in the rooms.
So they would be using copper for it then?
Their sewage systems were made of lead pipes, actually.