Apple cider vinegar

my skin has become very dry. I have to put on body lotion after my bath. I don't know what is wrong. Is it winter or another reason? I checked the web and it seems that the water here is different from Japan. The local water is much harder meaning it has too much calcium which dries out my skin.
Anyway, the web suggested taking "apple cider vinegar baths". So I put 200 cc into my hot bath. This made the water feel very soft and gentle. My skin is getting better. I think this works very well.