Place 1 cup of water in a small bowl.
Add gelatin and let soften.
Meanwhile, bring 2 cups of water to a simmer. Stir in salt and allow to dissolve.
Reduce heat to low and stir in gelatin mixture.
Remove from heat and whisk until combined.
Place 60 drops of essential oils to each jar. Add 6 food coloring if desired.
Stir each jar to evenly disperse oils and food coloring.
Lightly cover, and transfer to the refrigerator until solid. (You may also let them sit at room temperature to get solid, but I found they were much more firm when I used the refrigerator.)