Situation: I am facing a shower curtain rod and to my left there is a door.
Alternative situations: I push the shower curtain to the left before start preparing the bathtub in front of me for me. I want to bathe in the bathtub behind the shower curtain, there is a toilet on my right side. I entered the bathtub to take a bath and behind me was the toilet. I pushed the shower curtain to the left and entered the bathtub.
Question: What part of the toilet assembly to my right fills up with water as reserve?