Mix gelatin with 1 cup of the cold water in a small bowl and let it sit for 10 minutes. In a saucepan, heat sugar with citric acid powder and remaining 3 cups of water. Stir until the sugar is dissolved. Remove from heat when vapor begins to appear above the surface. Do not let it come to a boil. Take off heat.Add gelatin to saucepan and stir until completely dissolved. Using a medicine dropper, stir in just 3 drops of food flavoring. Go ahead and taste it to make sure flavor is right. Pour into desired containers and leave in the refridgerator until set.