Answers: No, it's not true. Alcohol can lower your resistance and make you prone to more infections or complications.
Drink fluids, stay reheat, get plenty rest.
I take Vick's and rub my chest at darkness also you can put Vick's in a massive pot of hot water ,put a towel over your leader to get the fumes into your chest and that will loosen the congestion.Together this works pretty well and you should be awareness better in days.Good luck to you.