Sponge of Bathing (3.5e Equipment)
From D&D Wiki
Sponge of Bathing: It is said that the Sponge of bathing was created by Thurin of Rathium. He was a man obsessed with cleanliness while on his adventures. He wanted a lightweight item to replace the many pounds of soap he carried. his sponge made him a very wealthy man.
This simple, flavorful device is usually made with sea sponge, but has been seen as palm sized beanbag sacks. A Sponge of Bathing starts out dry but when activated, once a day, begins a slow steady saturation. Small effervescent bubbles begin to form, providing a wet sponge that can be used to wash oneself. the saturation lasts until 2 gallons of water are generated, the bubbles cease and the sponge dries to be used again the next day. since its invention, several different style have been created.
Weak ;CL ; Craft Wondrous Item, create water, Prestidigitation; Market Price: 100gp