Rinse the potatoes well.Using a mandolin or cheese slicer, slice the potatoes thinly and place in a large bowl. Cover with water and a couple handfuls of ice. Let soak 30 minutes.
Drain the water from the potatoes. Add more water to the potatoes and stir around to rinse. Drain the water and repeat. Continue rinsing until the water is clear.
In a medium saucepan add the 4 cups of water and vinegar. Bring to a simmer over medium heat.
Add the potatoes in batches and cook for 3 minutes to blanch (the potatoes will turn from an opaque white to a clearer white). Strain from the water and place on a cloth towel. Lightly pat to dry both sides. Repeat with the remaining potatoes.
Add about 3 inches deep of oil into a deep fryer or Dutch oven. Heat to 375 degrees F.
Add the potatoes, in batches, to the oil. Fry for about 3 to 4 minutes, flipping occasionally or until they are golden brown and crispy.
Strain the potatoes from the oil and place on a wire rack or paper towel. Season immediately with desired seasonings (recipes below). Let cool completely before serving. Tip: Can be stored in a sealed paper sack for a few days. Be sure to continually check your oil temperature to ensure it stay around 375 degrees F.