Grandparent's Flaky Pie Crust

Toss together all dry ingredients. Work cold butter into the flour mixture, leaving some pieces about nickel size and others peas size. Make a well in the center and add in the apple cider vinegar and 3 tablespoons of ice cold water. Work into the dough, adding more water as needed until the dough folds and forms but is not tacky or sticky. Separate the dough into two balls and flatten each to make a disk. Wrap each disk in plastic wrap and store in the fridge until ready to use.