In the Name of Allah, the Inspirer of Truth.
Assalamu Alaikum Warahmatullahi Wabarakatuh

We regard alcohol used in flavourings as permissible because it would be negligible in the end product. Because of this Coca Cola is permissible, refrain if you wish however. Alcoholic flavourings is very common now even in dry products. Added alcohol is impermissible.

Coca Cola
http://www.gmwa.org.uk/foodguide2/index.php?page=viewquestion&id=160

Alcohol flavourings
http://www.gmwa.org.uk/foodguide2/index.php?page=viewquestion&id=85

And Allah knows Best
Wa Alaykumussalaam Wa Rahmatullahi Wa Barakatuh

www.foodguide.org.uk