Here are the chords to the whole thing, according to The Irish Songbook (that Clancy/Makem thing)

Chorus:
(C)Whiskey, you're the (C7)devil, you're (F)leading me a(C)stray,
(F)Over hills and (C)mountain and (D7)to Ameri(G7)cae.
You're (C)sweeter, stronger (C7)decenter, you're (F)spunkier than tae;
O, (C)Whiskey, you're my darlin', drunk or (G7)so(C)ber.

Verse:
Oh, (C)now, brave boys, we're on the march
And (G7)off to Portugal and Spain.
The (F)drums are beating, (C)banners flying;
The (D7) devil a-home we'll (G7)come tonight.
(C)Love, (G7)fare thee (C)well with me tithery eye, the doo-de-lum, the da,
Me(G7)tithery eye, the doo-de-lum, the da,
Me (F)rikes fall, tour a (C)laddie,
Oh, there's whiskey (G7)in the (C)jar. Hey!

***

I tried to sing it, to test these -- but C is a bad key for moi, so I'll have to knock it down to A to check them.

Sarah