Pic in post #9 is close enough to the inside of the bowl for me to call it the inside of the bowl.
Thanks for the lesson on potable water. I’m a civil engineer; a refresher is always useful.
http://ricks-eastasiablog.typepad.com/.a/6a00e553d9b7f28834010536cf2fb8970c-popup
Luckily, you are not a plumber. The hose does not come out of the bowl, no matter what you think! See the link for a typical example. Occasionally you find toilets which have fixed nozzles mounted inside the bowls, but you use an external knob on the side to control the stream.