Green’s Dictionary of Slang

(US) strong alcohol, often whisky, brandy.

1850		L.W. Garrard Wah-to-yah and the Taos Trail 193: Come in and take a ‘horn’ – a little of the awerdenty.
1968		R.F. Adams Western Words (2nd edn) 10/2: Awerdenty – In trapping, an early name for whiskey.
1994		(con. late 19C) J. Legg Buckskins and Blood 47: He sat holding his head in his hands. ‘Ain’t used to awerdenty, are ye?’ Sharp said with laugh.