Angela, i applaud you asking for what you need from him. the chances of him "complying" are slim if he is drinking, and whether something is written or not is unlikely to make a difference there.
it is true that it is his journey and needs to be his "program", but since you are with him, it affects yours and setting your boundaries and sticking to them is more than sensible. it is the only way to not get sucked down the drain with him.
it is great he wants nothing more than to be sober....but there will b the times he wants nothing more than drink, and whether something is written down, signed, sealed and delivered will make no difference.
i do not know that you need Alanon, but surely checking it out and talking with folks there will be helpful in you deciding whether it will be helpful to you.