Drinking advice

Okay i need as much advice as i can get from you guys.. My boyfriend is 26 and hes a alcoholic. He drinks abt 1 and a half liters of vodka every single day plus beers. He gets really bad withdrawal symptoms if he doesnt. This morning he woke up and started puking real bad. He told me he needs to stop or its gonna kill him. Does anyone know how we can break his habit safely? Coronavirus closed everything down here so rehab is not an option at the moment.