Thank you for the question, Mr. Ayoub.
My proposal would solve your problem with unbelievable ease. It would put an end to the federal-provincial bickering and make your question irrelevant. All you would have to do is prohibit the sale of these filthy products and you wouldn't have a problem on your hands. Case closed.
Now that would probably be the best solution. Barring that, any other measure would simply be a band-aid.
We aren't going to tell you to go meddling in provincial affairs, since that wouldn't be appropriate and would simply spark a turf war. Nothing at all would come of it. Consider, however, what does clearly fall under federal jurisdiction: the container. The federal government has the authority to restrict the amount of alcohol per container to one standard drink. That's a very easy thing to do and would apply country-wide. Labelling and packaging are a federal responsibility. At least do something on that front.
Yes, points of purchase are in the provincial domain. In that regard, the CCSA's recommendation that these alcoholic beverages be made from ethyl alcohol is a good one. Honestly, though, the problem would disappear altogether if the government were simply to ban them from the marketplace.
That wouldn't stop people from mixing their own beverages, of course, but they would be doing it themselves and would know what they were doing.