1/4-1/2 cup white sugar (or equivalent of another approved sweetener)
3 envelopes unflavored gelatin or 3 TBSP of bulk gelatin
1/2 cup fruit juice (fresh or frozen concentrate, 100%)
stir all ingredients in small saucepan, heat til sugar dissolves. pour into greased molds (coconut oil,butter,or approved oil), refrigerate til firm.
You can use a brownie pan or if you like the flavor, try a special candy mold. Wilton has some ideas (search gummies)
Experiment with juice, pineapple seems to pack a good flavor, I've heard someone suggest the leftover juice from watermelon.
Wilton has a "tool kit" that looks like just a squeeze bottle and a brush to clean it out with. It may be a good idea if you're doing tiny gummies to pour the mixture into a squeeze bottle and squeeze it out into the molds.
You can also dust the greased molds with white sugar for a crystallized coating on top.