27 CFR §19.296
Fermented materials that a proprietor intends to use in the production of spirits must be:
- (a)Produced on the bonded premises where used;
- (b)Received from a bonded wine cellar in the case of wine;
- (c)Beer received from a brewery without payment of tax, or beer that was removed from a brewery upon determination of tax; or
- (d)Apple cider exempt from tax under 26 U.S.C. 5042(a)(1).