Translation taken from here.
Credit goes to Ogawaa.

So why does Chaldea have a potty with them?

I was afraid Serenity's line would contain something else after that "If you'll allow me...", thankfully it was tamer than that.

boredman23 said:

So why does Chaldea have a potty with them?

For when Da Vinci decided to create baby Mashus.

I think that's actually the cruiser.

Which makes me wonder why they've got a potty, and why the plumbing broke given they've such a small crew and DaVinci didn't build it cheaply (she used magic to make the inside much bigger for example).