Slice kielbasa thinly into 1/8" slices. Cover bottom of baking pan with a layer of kielbasa slices.
Peel potatoes, slice thinly. Layer on top of sausage. Add layer of onion and celery. Dot top with butter. Pour on water.
Bake, covered, about 35 min. at 350°F (or until vegetables are tender). Remove from oven, spoon sauerkraut on top. Mix soup with 2/3 can water. Pour over casserole, return to oven for 30 minutes.
Submitted by Gretchen Grant Contributed on: and modified on Tuesday March 21st, 2006