Preheat oven to 350 F.
In a small mixing bowl, combine one cup of the sugar with the cake flour and salt.
In a large mixing bowl, whisk egg whites, water, vanilla extract, and cream of tartar until frothy.
Slowly mix in the remaining 3/4 cup of sugar.
Keep beating until the mixture looks like a fluffy white cloud (medium peaks).
Dust the top of the foam with a little bit of the flour mixture and, using a spatula, gently fold it in.
Continue adding flour and gently folding it in until all of the flour mixture is incorporated.
Fill cupcake liners almost all of the way to the top.
Bake for 12 minutes or until cupcakes bounce back when lightly touched.
