how many ounces is the bottle of taco sauce? i have one very large one, so I'd rather use some of that up rather than buying a new bottle

Since the taco sauce is added after the cooking and pulling, it appears to be somewhat of a condiment. I would add the cumino, brown sugar and cola and then start with about half a cup of the taco sauce. Give that a taste and add more if you feel it needs (or could use) it. then a little salt and pepper to taste.