Mix flour, water, & acidic medium until well incorporated. Cover with greased plastic wrap and sit at room temperature for 12-24 hours.
After 12-24 hours, warm dough for 10 minutes by placing in a warm oven.
Mix warm water, yeast & sweetener and add to dough. Mix well by kneading with hands. Cover with greased plastic wrap and let rise in a warm oven for 30-45 minutes or until doubled.
After 30-45 minutes, sprinkle 2 tsp. of salt & 1/2 crushed tablet of Vitamin C and knead well with hands until the dough is tough and the gluten is well-formed. Divide dough in half and flatten out each piece into a rectangle on counter top that is dusted with arrowroot starch. Roll each loaf and tuck the ends. Butter two bread pans and place each loaf in it's pan. Place in a warm oven & let rise, uncovered, another 30-45 minutes
After 30-45 minutes, carefully remove risen bread out of oven and preheat the oven to 350 degrees.
Bake the bread at 350 degrees for 40 minutes or until internal temperature reaches 180 degrees. Remove bread and let cool in pans for 5 minutes, then remove and let cool for 10-25 minutes before cutting.