27 CFR § 19.296
Fermented materials
April 24, 2020
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).
(26 U.S.C. 5201, 5222, 5223)