Prep molds. Spray your silicone molds well with cooking spray and set aside. I like to put all of my molds on a baking sheet for an easy, contained work area.
Bring sugar mixture to a 290°F. In a medium pot, combine 1 cup sugar, 3 Tbsp water, and ¾ cup corn syrup. Bring to a boil, and cook until 290°F. Immediately remove from the heat
Assemble other ingredients. While the sugar is cooking, assemble other ingredients. In a bowl or measuring cup, measure ½ cup tart cherry/lemon/orange juice and mix in 50g of gelatin (roughly ¼ cup + 1 Tbsp). Whisk quickly to evenly distribute and allow to bloom and begin to gel.
Measure out separately: 15g pectin (roughly 3½ tsp) and 1¼ tsp citric acid. Have your pinch of salt nearby, along with your flavored oil.
Mix in the coagulants and flavor. Once the sugar mixture reaches 290°F, remove immediately from the heat. Use a spatula to scrape the gelatinous blob of bloomed gelatin into your sugar mixture. Sprinkle in the 15g pectin with a pinch of salt, 1¼ citric acid, and 1 tsp fruit flavoring oil. Stir constantly until dissolved.
(As needed) Remove gelatin clumps. I find that my gelatin can sometimes clump and not dissolve evenly. When this happens I stir for about 1-2 minutes, then do my best to remove any large clumps of gelatin entirely so they don't get in the way of filling the molds.
Work quickly to fill the cavities. Some silicone molds come with droppers. Use the droppers to fill each mold cavity ¾ of the way. Using droppers can be tedious, but can yield clean gummies with minimal feet and strings. If you don't have a dropper or don't want the tedium, pour some of the mixture over the molds and scrape off excess. This can be messy, but is also much faster.The mixture will begin to thicken over time so work quickly! You can re-heat gently on low heat for 1-2 minutes if the mixture becomes too thick, but I wouldn't do this more than once. Allow the molds to set overnight. I've had success turning out gummies after about 30 minutes, or even by the time I finish dropper-ing all my molds, but it's easiest to set overnight.