Adventurer's Waterskin

You were fortunate enough to find this, for anyone who ventures into the wild lands will find no greater need than drinking water.  This waterskin looks like most others, fashioned from the bladder of some animal and cured to perfection.  Though it isn't pretty, with its leather strap and a leather/cork plug that occasionally leaks, it is functional and serves its purpose in carrying water for you.  It's smaller than most waterskins, unless you're a smaller person who doesn't need as much water as others, but it will work as an emergency backup.

You will find, after you've carried the water skin for a while, that you don't ever seem to have to re-fill it.  There is always water inside it, even if it isn't cold or pure like it came from a mountain stream.  Lukewarm water is good enough when you're thirsty, and it tastes like water that was carried around in the cured bladder of some animal.  What more could you truly hope for, in the end?

The water in this bag isn't "endless" and won't constantly flow, but it will provide up to a gallon of water every 24 hours, forever.  And hopefully you won't ever find this out, but the waterskin will hold up to the flames of an ancient dragon, or the body juices of a gelatinous cube.