Glycerin is not necessary, but will give the finished product more body, a more syrupy quality.
Boil water; stir in Splenda.
Remove from heat. Add coffee and stir well.
Stir in syrup and vodka.
Add glycerin (if using) at the very end.
Store in a cool dark place for 2 to 3 months before using.
Per Serving (excluding glycerin): 48 Calories; 0g Fat (0.0% calories from fat); trace Protein; trace Carbohydrate; 0g Dietary Fiber; 0mg Cholesterol; 1mg Sodium.