He has nothing to do, he can hand wash his clothes, why is this an issue? You really are not buying the load of cr@p that he cannot find a job because he doesn't have clean clothes...are you?
I must be honest, I do not understand you, you are giving him a free ride, he has no responsibility,no drive, no job, no nothing to offer and you cling to him like saran wrap.
As for telling him, easy "I am not coming home yet, I will pay the bills through October and then you are on your own, if I were you, I'd get off my butt and find a job."
And, I would start looking for an apartment for myself.
That is what I would do, to me you are making this much more difficult than it is.
Work on you, are you going to meetings? I would be beating down the doors to get into the next one.