Make the coffee syrup in a medium pot by heating the water and the sugar up. Bring to a gentle boil. Stir continuously, making sure the sugar fully melts. Keep on medium heat for at least 5 minutes until the syrup is formed. Remove from heat.
Once the syrup has cooled down for 5-10 minutes, add the instant coffee one spoon at a time, making sure each spoonful is fully dissolved before adding more. Thoroughly mix the coffee in until the syrup reaches a creamier consistency and it's fully amalgamated. Set aside to cool down to room temperature.
Add the vodka, mix thoroughly and decant the coffee liqueur into your 4 airtight bottles previously cleaned and dried.Enjoy cold or at room temperature!Store in a cool dark place for up to 12 months.