Llewelyn is talking about hotel rooms here, but his line has a double meaning. From here on out, he's having to take his life one day at a time.

Although Llewelyn realizes someone will be after him for the rest of his life, he realizes that there are two parties after him—and that's not including Chigurh, who is an army of one. As he reaches the height of his determination, he has to double up on it.