There’s plenty more behind it of course, but you’ll be aware that W-K is fundamentally a vitamin (thiamine) deficiency. Wherever he goes, adequate nutrition and taking his vit supplements will be important to avoid repeats.
They won’t hold on to him forever but having no home should kick the care services into action trying to find him somewhere.
If it’s a biggish hospital there’s probably at least one ALD specialist nurse attached to a hepatology service who should be taking an interest (though probably massively overrun too). If not at this particular hospital, there should be one somewhere relatively close by. Trouble is, he’ll need to be willing to listen, same as all addicts.
Best of luck with him