Place cottage cheese in a strainer and let drain for about 1 hour or until most of liquid has been drained.
Preheat the oven to 425 degrees F (220 degrees C).
In a large bowl, combine cottage cheese, sugar, flour, lemon juice, salt, egg yolks, evaporated milk, and regular milk. Mix well.
In a separate clean bowl, beat egg whites until firm. Fold into cottage cheese mixture until smooth. Pour into pie crusts.
Bake for 15 minutes in the preheated oven; reduce oven temperature to 350 degrees F (175 degrees C) and bake for an additional 25 minutes, or until a knife inserted in the center comes out clean.
Cool pies on racks, then refrigerate for at least 2 hours (or up to 1 day for better flavor) before serving.