Going to the restroom               

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toilet; restroom; lavatory

toilet paper
toiretto peepaa    

toiretto: toilet
peepaa: paper

I want to go to the restroom.
Toire ni iki tai no desuga.    

toire: rest room, toilet
iki: go
tai: want

Where's the restroom?
Where is a toilet?

Toire wa doko desu ka?    

toire: rest room, toilet
doko: where

Wait a minute. I need to go to the restroom.
Toire ni iku node, chotto matte ite kudasai.    

toire: rest room, toilet
iku: go
chotto: a minute

A toilet sign found in Japan, photo courtesy of Mr. M