The Collaborative International Dictionary of English v.0.48:

Ciderkin \Ci"der*kin\, n. [Cider + -kin.]
   A kind of weak cider made by steeping the refuse pomace in
   water.
   [1913 Webster]

         Ciderkin is made for common drinking, and supplies the
         place of small beer.                     --Mortimer.
   [1913 Webster]