Most of the time the excessive discharge as white watery form mainly show the presence of candidial vaginal infection
. This is a type of fungal infection
which is very common because of improper hygiene. This type of discharge is not related to the calcium defieciency, so taking calcium supplementation is not going to impprove this condition.
I would suugest you to consult a gynaecologist regarding this problem and after examination and may be some investigation they will confirm this condition and than will prescibe you accordingly.
There are many antifungal drugs available which can easily cure this condition and after that you have to keep proper hygiene to prevent you from reinfection.
Thanks and take care