You need to be baptized by the Holy Spirit as per scripture. You only need to be baptized by someone that knows the bible. A water baptism only a show of repentance but the baptisms of the Holy Spirit is to be born again.
According to my raising in the catholic church (not saying its right or wrong still trying to make up my mind on that one) one cannot baptize them self. BUT in order to be baptized you do not need holy water. As long as you are a catholic and have received the sacrament of confirmation if someone where dying before your eyes and they asked to be baptized you DO have the authority to baptize them using any type of pure water. (not anything carbonated or anything) but you couldn’t do that on like a daily basis unless you were ordained only in an emergency and if the person asked you cannot offer. hope that helped :]
Yes Yes Yes. It is not the Religious act of being Baptized but it is the desire of your Heart to Declare your dedication to God.
Commonly you would be Baptized in a public setting since it is also a public declaration of your devotion to God.
Your Heart to Love and Serve God is greater than any Religious propriety.