Barbecued beef sandwiches for a crowd

2    Beef briskets, trimmed
           - about 12 lbs.
      6 c  Barbeque sauce
      2 c  Water
     50 ea Hamburger buns
 
  Place briskets in a large roasting pan. Combine barbecue sauce and water;
  pour over meat. Cover tightly and bake at 325 for 4 to 4 1/2 hours or
  until fork-tender. Remove meat from juices; cool. Skim fat from juices.
  Thinly slice meat; return to pan and heat in juices. Serve on buns.