Put the cold water in the bottom of a medium sized bowl.
Sprinkle the gelatin on top. Let sit for 5 minutes.
Pour the water over the bloomed gelatin.
Whisk until the gelatin dissolves. Strain out any lumps.
Add the drink mix and whisk until smooth. Taste and add more drink mix if needed.
Pour into a glass storage container and refrigerate until firm.
Notes
Drink Mix - I tested this recipe using Ultima Replenishers drink mix. If you use another brand you may need to adjust the amount added.Gelatin - For soft jello use 2-2.5 tablespoons of gelatin. For firmer jello, like jigglers that hold their shape, use 3-4 tablespoons of gelatin.