Sponge of Bathing (3.5e Equipment)
From D&D Wiki
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.
Cost to Create: GP, XP, Day