For some typical German food like Wienerschnitzel, Sauerbraten, etc. visit:
Alpenrose in Holland (alpenroserestaurant.com).
Cedar Springs Brewing Company in Cedar Springs. (csbrew.com)
The Old Goat Restaurant, at 2434 Eastern Ave SE, Grand Rapids is going to have German night every Thursday at 4 to 10 PM featuring four dinners from the now closed Schnitzelbank Restaurant
You can find great German style sausages at these local markets.
Frank's. 750 Fulton Street NW, Grand Rapids
Sobie's. 3919 Remembrance Road NW, Walker
Kingma's. 2225 Plainfield NE, Grand Rapids
Bob's Butcher Block. 7647 Riverview Drive, Jenison
Lewandoski's. 1107 Walker NW, Grand Rapids