A toilet was a fixture found in refreshers, used for the disposal of bodily wastes. Toilet paper was used to maintain personal hygiene.
In Robot Chicken: Star Wars, an AT-AT pilot is seen using a toilet in Blizzard 4, where Luke Skywalker throws explosives into at the Battle of Hoth.
*Yoda: Dark Rendezvous
*Star Wars: Dark Times 7: Parallels, Part 2
*Lando Calrissian and the Flamewind of Oseon (as Sanitation unit)
*Lando Calrissian and the Starcave of ThonBoka
*The Last One Standing: The Tale of Boba Fett (an "open-air toilet")
*Death Star (As "latrine")
*The Wildlife of Star Wars: A Field Guide