The recipe says that it serves 6-8 people, and we had 11 people, so I used three cans of everything, which turned out to be just a bit too much. But everyone ate until they were full and there were still leftovers, so I guess that's good.
About all you can do beforehand is to cube the sausage.
2 cans (10-ounce each) tomatoes
2 cans (10 1/2-ounce each) condensed French onion soup
2 cans (10 1/2-ounce each) concentrated beef consomme
2 cans (about 1 pound) white rice (measure using empty soup can)
2 cans (about 1 pound) kielbasa sausage (measure using empty soup can)
1/2 cup (1 standard stick) butter, cut into cubes
Combine all ingredients in Dutch oven. Bake using 8 coals under the oven and 17 coals on the lid. Cook for about 1 hour or until rice is tender, refreshing coals as required to maintain heat.