How to Make It
Preheat the oven to 350°. Butter six 1-cup ramekins and coat with granulated sugar, tapping out the excess. Place the ramekins on a sturdy baking sheet.
In a large bowl set over a pan of simmering water, melt the chocolate. Off the heat, whisk in the water and cocoa until smooth. In another bowl, using a handheld electric mixer, beat the egg whites at medium-high speed until soft peaks form. Gradually beat in the 1/3 cup of granulated sugar and beat at high speed until the whites are firm and glossy, about 1 minute. Fold one-fourth of the beaten egg whites into the chocolate mixture, then fold in the rest until no streaks of white remain.
Spoon the soufflé mixture into the ramekins and smooth the tops. Run the tip of your thumb around the inside rim of each ramekin to clean off any spills and to help the soufflés rise evenly.
Bake in the center of the oven for 16 minutes, or until very puffy and set around the edges. Dust the tops with confectioners' sugar and serve.