Bucket of Everfilling (3.5e Equipment)
From D&D Wiki
A Bucket of Everfilling is a special item. A Portable Hole was merged with a regular bucket though magical means. Now, that bucket can carry up to 10 gallons of any type of liquid in it. This item would be worth 1,000xp and 2,000 gold from the right buyer. If you want to buy one, it will only cost 1,500 gp.