A small round cantine, that is strapped around its wearer with a leather strip. It has the ability to never run dry. It will be able to contain any type of liquid such as acid or lava. It will also never run out.
A world where most people know a few cantrips and even non-magical people can help to cast spells. Which is just as well because the big spells can only be cast with the help of large numbers of people.Most large spells tend to protect borders and stop earthquakes as they can be done legally, but there are those willing to cast bad large spells s well.A major part of law enforcement in this world is preventing evil magic.