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In a food processor, process the graham crackers until finely ground. Add butter and water and process until the crumbs clump together. Press the crumb mixture into bottom of pie plate and about 1-inch up the sides. Bake for 10 minutes, then let cool.
In a medium saucean mix the 2/3 cup of sugar, cocoa, cornstarch and salt. Gradually add half of the milk, whisking until smooth. Whisk in the rest of the milk. Turn the heat on to medium and cook, whisking constantly, until the mixture thickens and comes to a boil, about 10 minutes.