1 ½cupswateror around 2 to be lighter, less for stronger
Instructions
Place the pitted cherries, lemon juice and sugar in a blender and blend until smooth and well mixed. I'd suggest tasting at this time to see if you need any more sugar, if you prefer sweeter, or lemon, if you prefer more tart (it will be stronger than end drink but you should have good sense of flavor). If you like, you can strain to remove any skins but if you have a high speed blender, this probably isn't needed. You can keep this syrup in the fridge for a day and then stir before using.
To serve, add the water and stir well. I'd suggest adding on the lower side first and then seeing if it is the strength you want. Serve over ice.