Combine warm water, sugar and yeast in a large bowl.Let stand for 5 minutes until frothy and bubbly.Using a dough hook, mix in the milk, baking soda/water, salt and 1 cup of flour until well mixed.Add the remaining 1 1/2 cups flour until dough is thick and sticky.Spray the inside of a 11" spring form pan with cooking spray.Drop the dough in the pan and try to spread dough to edges.Dough will spread out quite a bit when rising.Cover pan loosely with plastic wrap sprayed on the inside with cooking spray.Place pan in a warm place and let dough rise for about 1 hour. *See photo belowPreheat oven to 375F.Remove plastic wrap and bake for 20 minutes or until golden brown.Brush the top of the bread lightly with butter.Cool completely in pan.