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Measure your water into a saucepan and place it over the stove. Bring the water to a rolling boil over high heat. While the water is still boiling, pour in your gelatin. Keep boiling the water until the gelatin dissolves. This generally takes around one minute. If you prefer a lime flavor, you can opt for lime gelatin instead of lemon gelatin. Remove the saucepan from the heat. Pour in the lemon juice, cold water, and vodka. Use a spoon to mix all the ingredients together.
Boil your water. Add your gelatin. Add the vodka, lemon juice, and cold water.