Catloveme suggested
"If she wants to drink, she should provide herself the money, transportation, location, (reliable) childcare and other things she "needs" to drink, apart from your home and children. If she is not able to provide herself these things, to continue drinking, you need not take it on as your problem, with the exception of keeping the children safe."
How would you do it technically? Separate our bank accounts? She has no separate income - so I'd have to give her money -but then she would still use it to buy the drink.
And about letting her fall on her but and face the consequences - I don't know how to do it without it being me that in the end takes the brunt. For example if the health insurance company learns she is an alcoholic and she looses coverage - it becomes MY problem as the bread earner.
And I can't just let her fall. She is the mother of our children.