I just wanted to give everybody an update. The housebreaking issues have been cured! With Zeus, I just put the water bowl in his elimination spot, and the problem was solved.
Voodoo was a bit tougher. His potty area was a large chunk of my kitchen/dining room, and just moving a food bowl wouldn't fix it. Moving his gigantic crate to that area was also out of the question. Instead, I used the old queen-sized comforter he sleeps on in his crate. I spread it out right in the middle of the area. He got the idea.
Thanks for the help, all!