Mix together the elderberry syrup and water.
Pour 1/2 cup of the liquid into a small bowl. Place the remaining liquid in a small saucepan or pot. Turn the burner to low heat.
While the liquid is warming up you're going to prepare the gelatin. Just keep an eye on the stovetop - when the liquid is hot but not boiling, remove the saucepan/pot from heat. For me, this usually happens just after I finish preparing the gelatin.
To prepare the gelatin to be added to the saucepan/pot: Add 1 tablespoon of the gelatin to the liquid in the bowl and stir it in with a fork. Repeat this process, stirring each time, until all the gelatin has been mixed in.
When the stovetop liquid is hot but not boiling, stir in the gelatin mixture and whisk thoroughly to smooth out any lumps. If you're using vitamin c powder and/or probiotics, allow the mixture to cool to 105F - 110F, then stir in the powder and go to the next step. I don't use a kitchen thermometer to check - a plain old digital thermometer for checking body temperature works just fine.
Pour the gelatin mixture into your silicone mold. If you're using the gummy bear molds pictured in the post, use the dropper provided to make the process easier. If the liquid starts to thicken to the point that it becomes difficult to work with. Place the pot back on the stove over low heat until it warms up and becomes runny again.
When you're done filling all the molds, pop them into the fridge so that the gummies can firm up. The amount of time it will take for the gummies to firm up depends on the size of each gummy, but in general it should be about 1 - 2 hours.
When they're ready, pop them out of the mold and store them in an airtight container in the fridge.