Hi Redlight
So sorry to hear you are going through this, and your son too. It is a very stressful situation to be in.
First off, your son is in denial and this is absolutely part of the usual process. Nobody of any age drinks secretively or hides bottles unless they have a very significant problem. By talking to him, you are threatening his ability to carry on using the alcohol he needs and he is terrified, hence he will say anything to try and put you off.
Do you have any idea how much/how often he’s drinking?
The worst news here, which you may not want to hear, is that there is nothing you can do or say that will convince him to get help unless he is ready. That is not to say that you shouldn’t shine a light on his problem.
There are two things here that are crucial: first, You need to get as educated as you can on this disease and you will find lots of advice online about what not to do with an alcoholic. There is lots of behaviour that is considered to be enabling and you need to avoid these behaviours - that is often very difficult, particularly for a mother but it is absolutely vital. The second thing is that you must take care of your own emotional well-being first and foremost. As @Quicknamechange7 has said, Alanon would be a great start. They might be a good support for you and help you to detach with love, as they call it. Meetings are a bit tricky at the moment but they do have a helpline number on their website.
If you want to start presenting your son with some practical options for help, you can only put these in front of him (when he’s sober) and then detach for your own sanity. He might well react angrily if you do but he will still be taking it in, even if he doesn’t use it for some time. Your GP would be able to advise you on local help services but, I’m afraid it is not a well-funded part of the NHS. If you have the means, I would recommend finding a specialised addiction counsellor. They will be able to help you, as well as recommending the best/most cost-effective rehab services.
What is your husband wanting to do to come down harder?
There are plenty of us on here who have gone through similar with husbands, sons, fathers...
Really good luck to you and take care.