Basic phyllo dough: In the bowl of a mixer fitted with a dough hook, combine 3 1/4 cups of the flour and salt. Add the water, olive oil, and vinegar or lemon juice. Mix on low speed for 3 min., then increase speed to medium. Knead with the hook, stopping the mixer to add additional flour in 1/4 cup increments as needed, until the dough is very smooth and pliant. The whole mixing process should take about 10 to 12 min.
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Transfer the dough to an oiled bowl. Cover tightly with clinging film and let stand for an hour at room temperature. You can store it the dough, well-wrapped, in the refrigerator for several days, or in the freezer for up to two weeks. Always bring to room temperature before using. ( if it's frozen, first defrost in the refrigerator).