In a small bowl, mix together the vinegar and water. Place in the refrigerator for 10 minutes. The butter should also be cubed and chilling in the refrigerator too.
In a large bowl, stir together the flour, sugar and salt for the pie crust.
Remove the chilled butter and toss it in the flour mixture. Flatten each cube between your fingers and toss to coat with the flour mixture. Continue to massage and roll the butter between your fingers until it’s a coarse mixture with pea-sized to almond-sized pieces throughout.
Add 3 Tablespoons of the vinegar water to the flour mixture and stir with a rubber spatula. Continue to add the vinegar water 1-2 Tablespoons at a time, until the dough is almost entirely hydrated. You may not need to use all the water. When you pinch the dough, it should hold its shape.
Turn the mixture out onto a work surface and pinch the dough together with your hands, gathering any loose bits of flour and pressing it into the dough. If the dough isn't coming together and is too dry, wet your hands with the ice water and work it into the dough to hydrate it a bit more. Work quickly and avoid over mixing.
Divide dough into two equal pieces. Round and flatten each into a disc shape. Wrap each with plastic wrap and chill for at least two hours before rolling out.