Wesley,

A gallon plastic milk jug is a good place to start. They are usually cheap and readily available. It will not have much volume or much class, but it will work. A gallon glass jug as Roger described above is also usable.    You can get a number of ceramic jugs of various sizes in new stores and antique shops. Since there are no "jug" standards, just try a lot of jugs until one "fits" for you.

Roger in Baltimore