Dit Da Jow is an herbal tincture developed and used by Chinese martial arts masters over thousands of years. Each master and their family developed their own specific recipe, a closely guarded secret passed down over the generations. Some of the White Tiger formulas were developed by the monks at the temples, while other came from rural villages in China that Fung Do Duk traveled to. We also have all of Grandmaster Doo Wai's family recipes, unchanged formulae dating back thousands of years.
Dit Da Jow is basically an herbal mixture, soaked in an alcohol/water solution for some period of time in a darkened place. Alcohol solutions can be wine, vodka, gin, or such. The tincture is kept out of the light since light can break down some of the herbal biochemicals that work their magic. The longer it can be left to soak before use the better, as it becomes stronger over time.
These herbal formulations hold full advantage of hundreds and thousands of years of Chinese apothecary experience. The herbs combined together have synergistic effects above and beyond what each herb could do by themselves. Therefore if you should obtain an authentic Chinese Dit Da Jow recipe, you should follow it. One probably cannot improve on what has taken hundreds of years to perfect. Just take it to a friendly Chinese herbalist/apothecary and ask them to fill the prescription for you. They will also be the best qualified to adjust the recipe for you if any of the ingredients are unavailable.