Blend: Add the blueberries, lemon juice, sugar, and salt to the base of a large blender. Cover with cold water, seal well, and blend on high for 30 to 45 seconds, until smooth (Note: if you have a smaller blender, use only 2 cups of water, then add the rest of the water to the pitcher in step 2 after straining)
Strain: Fill a pitcher with ice, then strain the blueberry liquid into the pitcher using either a fine mesh strainer or a nut milk bag. Both will remove the blueberry skins and seeds, but the nut milk bag does have a slightly smoother texture and is what I recommend!
Serve: Serve chilled and garnished with fresh lemon slices and blueberries, if desired. Leftovers will keep in the fridge for up to 3 days; just shake well before serving as the blueberries will settle.
Lemon Juice: Fresh lemon juice has a more balanced flavor and tastes sweeter; don’t substitute for bottled!
Sugar: I used organic cane sugar for this recipe, but agave or maple syrup would also work. The lemonade is moderately sweet, so feel free to adjust the sugar level according to your personal preference