When you can't find nutritional information

I went to a 7 eleven and no one at the store seem to be helpful with nutritional information, then I called the corporate office which was even worst. All I want to know is what is the size in terms of ml or ounces of the smallest size of their "gulp". I had the Cooper's Iced Tea in the smallest gulp (no big gulp) with a shot of that cherry syrup they have next to the fountain drinks.