1 cup pure Cranberry Juice
1 cup Lemon Juice
Add Cranberry Relish (recipe below, except puree it completely)
5 bottles of good Mineral Water (such as Perrier)
Sweeten with stevia or sugar to taste, add ice, orange and lemon slices, and float cranberries on top.
Another idea is to freeze some ice with an assortment of berries, lemons, limes oranges, etc. You can use a mold of some sort to create neat looking ice.