I use Dublin Dr Pepper syrup, from the distributor in Dublin, TX. I mix 13 1/4 cups syrup in a 5 gallon keg and fill the rest with water. If I want it a bit sweeter I mix 13 1/2 cups of syrup in.
The 5 gallon BiB costs $75. I generally just drive there and pick it up. I believe shipping is $10, so $85 total. It will come to about $0.65/liter or $2.40/gallon. But I buy it more for taste then for the price point.
As for a clone recipe, like most modern sodas, many of the ingredients are hazardous and some toxic. Pure caffeine is one of those substances that is toxic in pure form. However the original recipe for Dr. Pepper is known (it did not contain caffeine):
1/10 Ounce Raspberry Vinegar (containing only 1/8 Minim of Absolute Acetic Acid)
1 Minim Vanilla Extract
1 1/2 Grains Citric Acid
1/16 of 1 Minim Oil of Almond free from Hydrocyanic Acid
3/8 of 1 Grain of Phosphoric Acid U. S. P.
Burnt Sugar (Caramel) Color - 10 Minims
Simple syrup Q. S. [Quantity Sufficient] for 1 ounce.
I would be careful of that phosphoric acid as well. While not harmful, in and of itself, it can corrode metal and create hydrogen gas (it is also used as a rust remover). And a minim is 1/480th of an ounce, or roughly a drop. Keep in mind this was originally an apothecary recipe (i.e. it was from a pharmacy).
Really it is much easier, and safer, to simply buy syrup and do premix in a Corney keg. It is, after all, the kegs original purpose anyway.
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