
Place the berries in a small saucepan, pour in water and sugar. Bring to a boil over medium heat, turn heat down and let simmer for 10 minutes. Remove from heat.
Let cool and place in the blender. Pulse until smooth, then strain using a mesh strainer, fill 3 ice trays and freeze for 5 hours to overnight.
Add slushie blueberry ice to galloon dispenser with prepared lemonade and garnish with lemon slices.
Simmer 1 cup water and the sugar together to make a simple syrup, let cool. Add the 2 cups fresh squeezed lemon juice and stir together with 3/4 gallon of water in dispenser with lemon slices.