I know of a further verse, which I have not seen mentioned here. It comes after the second verse which is slightly different from the one given above

2nd Verse
Whisky's in the jug boys, corn's in the sack
Float on down to Shawnee Town and bring the rock salt back

and the third verse is

Well now the currents got het boys, take in some slack
Float on down to Shawnee Town and Bushwhack back