Roll 4 lemons on a hard surface with your palm. It will help to make the lemons more juicy. Cut 4 lemons in half. Put a strainer on a medium bowl then squeeze lemons.
Slice 2 lemons in rings and add in a pitcher with peaches.
Pour lemon juice, syrup, ginger beer, bourbon and water. Mix well with a large spoon.
Refrigerate until chilled.
Serve cold with ice.
Notes
Make this in a day or so advance so the flavors all have time to meld. You can add the sliced peaches & lemons right before serving if you would rather them not sit in the drink.