ant has no set rules or curfew. if he is staying out all night he lets me know, otherwise he has a key and is quiet when he does get in.
he is an adult as is his brother.
it is a given that I do not do their laundry or cook for them. if I happen to cook that night I do make enough for them if they tell me in advance they will be there. I do not buy pop or snacks at all. they must each pay 200.00 a month rent and pitch in on chores, and bring in laundry soap and other sruff if they see we are low on it.
they both know no women overnight.
no drugs or drinking would be tolerated by me. I do not have to tell them that.
He knows I will not visit in jail any more if that happens and do not bail out. he has no license but I do not drive him anywhere. he finds rides and boyfriend rides him to work and back.
I like your list of rules and think you should simply post them on the 'fridge minus the curfew. if he has a key he can come in ALONE and quietly and sober when he pleases.