Add the blueberries, sugar, and water to a medium saucepan and heat over medium heat until simmering. Simmer for 7-8 minutes, stirring occasionally and squishing the blueberries with a spatula. Remove from heat.
Strain the blueberries from the syrup with a fine mesh strainer, reserving the liquid and discarding the blueberry pulp.
Allow the blueberry syrup to cool at room temperature for 15 minutes. After cooling time, transfer the syrup to a syrup bottle or mason jar with a lid and store in the fridge for up to 2 weeks.