You can find in his diaries in 1796 references to drinking "a Jill of Cyder" in the mornings to help with health:
JULY 26. 1796. TUESDAY.
In conformity to the fashion I drank this Morning and Yesterday Morning, about a Jill of Cyder. It seems to do me good, by diluting and dissolving the Phlegm or the Bile in the Stomach.
July 28. 1796. Thursday
I continue my practice of drinking a Jill of Cyder in the Morning and find no ill but some good Effect.