Put 1 1/2 cups flour, salt and sugar in food processor until combined, about 2 one-second pulses. Add butter and shortening and process until homogenous dough just starts to collect uneven clumps, about 12 - 15 seconds. (dough will resemble cottage cheese curds.)
Scrape bowl with rubber spatula and redistribute dough evenly around blade.
Add remaining one cup flour and pulse until mixture is evenly distributed around bowl and mass of dough has been broken up. 4 to 6 quick pulses.
Empty mixture into medium bowl.
Combine vodka and water. Sprinkle over mixture
With rubber spatula or wooden spoon, use folding motion to mix, pressing down on dough until it is slightly tacky and sticks together.
Divide dough into two even balls, wrap in plastic wrap and flatten each into 4 in disk. Refrigerate at least 45 minutes or up to 2 days. Freezes very well.