private stock

noun1

1. •
   A supply of something, especially alcoholic beverages, belonging to a person or a commercial establishment and of such quality that it is usually reserved for the owner or for favoured friends or customers.

   • [T]o feed 126 souls, we had but . . . Three ham-sandwiches, and a pot of currant-jelly, and 197 bottles of brandy, rum, madeira, pale ale (my private stock) . . . — 1869