alias bottle {
  :Start
  var %x 99
  while (%x > 0) {
    echo -a %x bottles of beer on the Wall, %x Bottles of beer
    dec %x
    echo -a You take one down, pass it around, %x Bottles of beer
  } 
  echo -a No more bottles of beer on the wall, no more bottles of beer.
  echo -a Go to the store and buy some more, 99 bottles of beer on the wall. | Goto Start 
}

This one is never ending, once you have no bottles left, it goes back to the start.

alias bottle {
  var %x 99
  while (%x > 0) {
    echo -a %x bottles of beer on the Wall, %x Bottles of beer
    dec %x
    echo -a You take one down, pass it around, %x Bottles of beer
  } 
  echo -a No more bottles of beer on the wall, no more bottles of beer.
  echo -a Go to the store and buy some more, 99 bottles of beer on the wall. 
}

This one stops when there are no bottles left