Add water, alcohol and flavored Jello to a sauce pan. Stir to combine.
Sprinkle the Knox gelatin packets over the top in an even layer and allow it to sit for 5 minutes and "bloom". (This ensures the gelatin will dissolve and not clump together).
After the gelatin has bloomed, turn the heat on medium low and stir mixture until all the gelatin is dissolved and mixture is smooth. (Keep it under 173°F to ensure the alcohol does not burn off).
Remove from heat and use the droppers that come with the gummy worm molds to fill each one. To make a single gummy worm two different flavors, fill with a syringe from each end of the mold at the same time. Place in the fridge to set - this should only take about 30 minutes.
Pop gummy worms out of the mold and store in an airtight container in the fridge until ready to consume.
To make sour gummy worms, toss the worms in a 2:1 mixture of sugar and citric acid.