Place corn syrup, sugar, water & coffee granules in saucepan.
Heat over medium - stirring to combine.
Keep stirring & allow to come to a boil - boiling & stirring about 3-5 minutes
Remove from heat & add evaporated milk & vanilla.
Stir to combine.
Set aside to cool to room temperature before transferring to bottles.
Store in refrigerator for up to 6 weeks.
Heat in microwave for about 30 seconds to bring back to drizzle consistency before serving.