I would put anything valuable/sentimental that you would really miss in a storage facility somewhere. as for the legalities: no clue, but I remember living with it and it was hell. enjoy the weekend away from the madness: don't worry about stuff/the house as it won't make any difference to the outcome.
You can't make him share the bills at the moment, so perhaps in future buying $150 of groceries just before you go away is something you won't do.