Bring 2 cups of the water to a boil in a small sauce pan over medium heat and add the sugar. Stir frequently to dissolve. Once the sugar is dissolved, turn off the heat and set aside allowing it to come to room temperature.
While that water/sugar syrup is cooling, add the basil and lemon juice to a large cup or pint sized Jar and muddle well. Set aside.
Blend strawberries in blender or food processor until liquified.
Once sugar mixture has cooled down, add it to a large gallon-sized pitcher.
Drain the basil lemon juice into the pitcher, retaining the muddled leaves and discard them.
Add the blended strawberries.
Add the remaining water and stir until mixed well. Now would be a good time to try it and add any additional lemon juice or water, to suit your taste.
Refrigerate until cold. When you’re ready to serve, stir, and garnish with fresh basil and/or strawberry slices, if desired.