In a large mixing bowl, sift together the flour and salt. Working quickly so that it stays cold, add the olive oil by the tablespoonful, cutting it into the flour with your fingers or a pastry cutter, until the flour appears pebbly.In a cup, mix together 4 tablespoons of the ice water with the apple cider vinegar. Drizzle 2 tablespoons of the water and vinegar mixture into the flour, and using a wooden spoon or rubber spatula, stir into the dough, adding more water a tablespoon at a time until it holds together to form a soft ball. Take care not to over-knead the dough.