Water Purification Sponge

This fist-sized blue sponge absorbs up to 1 pint of water; squeezing the water out of the sponge filters and purifies it, making it safe for drinking, washing, and similar activities. Filling and emptying the sponge is a full-round action. The filtration is enough to remove mundane impurities and common diseases, but does nothing to protect against poisons, magic, and other exotic threats. Each sponge can cleanse 25 pints of water before deteriorating and becoming useless.