Recipes
To make Nuka Cola, you need carbonated water, an empty Nuka Cola bottle, a bottle cap, and Nuka Cola Syrup. [Cooking Station]
To make Nuka Cola Quantum, you need nuclear material, carbonated water, an empty Nuka Cola bottle, a bottle cap, and Nuka Cola Syrup. [Cooking Station]
To make Carbonated water, you need oil and purified water. What I imagine that happens is you purifying the oil into pure carbon, and adding it to the water. [Chemistry Station]
To get Nuka Cola Syrup, buy it from a vendor. It is a rare item, so don't count on always finding it.