Drain sauerkraut, place in pot. Add water, caraway seeds, juniper berries and simmer 35-40 minutes. Cook noodles according to directions on package and drain. In a large greased casserole place half of the sauerkraut, 1/2 of the sausage slices, all the noodles, top with the other half of sausage slices and cover with the rest of the sauerkraut. Spread sour cream on top and bake in a preheated oven at 400° for 30-40 minutes.