1 large btl (or 2 regular btls) of dry/semi-dry White Wine (I like Pinot Grigio, but Chardonnay would work as well)
1 cup White Rum
1 btl Champagne or Sparkling Wine
1 liter seltzer (You can also try a flavor like Lemon-Lime or Orange)
1 pint blueberries
1 pint strawberries (hulled, and diced)
Mix Wine, Fruit, and Rum in a large bowl and let stand for at least one hour (the longer this sits, the better the flavors will combine). When ready to serve add champagne and seltzer- I do not use the whole bottle of seltzer, pour some in and taste as you go. For stronger Sangria add less seltzer.
Serve over ice