Mix water, Truvia and ginger in small saucepan and boil 1-2 minutes. Reduce heat and simmer 6 minutes, or until liquid is reduced by half then allow to cool.
Add cranberry juice, vodka, triple sec and simple syrup to pitcher and mix well.
Fill cocktail shaker halfway with ice and top off with cosmo mix. Shake vigorously then pour into glass. Repeat for remaining servings.
Notes
Everyone will want to know what makes your white cocktail so special. Are you willing to tell them?