Folk art jug by Hungarian potter Laszlo Reininger.

Jugs like this were traditionally used in Hungary by farm workers to carry drinking water out to the fields.  The ball you'll hear rattling around in the jug is a holdover from the old days; because the narrow opening made it difficult to clean, the ball helped scrub the sides and bottom.  Today, the jugs are purely decorative items and are not intended for use with food or drink.