In a small pot, heat 1 cup water with 1 cup sugar. Bring to a boil until sugar has dissolved. Remove from heat and let cool.
In a blender, combine cooled simple syrup, lime juice, sliced peaches, and chopped ginger. Blend until smooth. Pour through a fine strainer (or cheesecloth).
Pour limeade into pitcher. Add remaining 1 ½ cup water. Stir to combine. Taste and add more water if necessary. Keep chilled in the fridge until ready to serve.
Notes
Store limeade in an airtight container in the fridge for to 3 days.
Fresh squeezed lemon juice may be used in place of lime juice to create a lemonade version.