If kept for a longer time, this drink gets washed out, as the ice cubes start to melt. To retain the coffee flavor for a longer time, freeze some brewed coffee in ice cube trays. Use these coffee cubes in place of regular ice.To make vanilla syrup, you just need three ingredients, 1 cup water 1 cup sugar ½ tablespoon vanilla extractIn a medium saucepan, add water and sugar. Boil on medium-high heat until the mixture thickens. This will take about 8 to 10 minutes. Once done, remove the pan from the heat. Add in vanilla extract and cool it down to room temperature. Store it in a clean glass jar for 2 weeks in the refrigerator.