@Echo Off
SetLocal EnableDelayedExpansion
For /L %%A In (99,-1,0) Do (
  Set X=%%A
  If !X!==1 (Set B=bottle) Else (Set B=bottles)
  If !X!==0 Set X=No more
  Echo !X! !B! of beer on the wall, !X! !B! of beer.
  Set /A X -= 1
  If !X!==1 (Set B=bottle) Else (