- Pour the water into a two quart or larger pan.
- Add the sugar to the water. Stir until the sugar dissolves.
- Add the concentrate to the sugar water. Stir until mixed.
- Using a funnel, add the syrup to an empty plastic bottle (make sure to close it with its cap when done). Refrigerate until cold.
- Fill any glass halfway with seltzer water. From the bottle, add the syrup to the glass. Stir until mixed (optional).