In a large bowl, combine the flour and salt. Cut the butter into the flour using a pastry blender or two knives to get a grainy texture and the butter is the size of peas. Gradually add the water, lifting and turning the flour mixture using a spatula to prevent a portion from becoming wetter than another. Add water if needed, a spoonful at a time, just until the mixture holds when pressed between your fingers. Form into two discs.