What does it men to be "spirit filled"? I have had this discussion on many occasions. I can tell you that a person need not be a Christian to be spirit filled, however, there is only one way to be filled with the Holy Spirit. People are always filled with a spirit of one sort or another and that spirit is what guides us.
And be not drunk with wine, wherein is excess; but be filled with the Spirit; - Eph 5:18 KJV
Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you. - Jhn 14:17 KJV
In Ephesians we are warned to not be drunk with alcohol. When we allow this to happen we let it take over our body and mind. We make foolish choices and do foolish things. Often to others we love. The world pushes it on us as a way to escape our problems. The commercials are always filled with attractive people smiling and having a good time. It looks glamorous. What they don't show you is the aftermath of drinking in excess. The flashing lights of the police car, the smoke rising out of a burning car, the bruises left on a women by her drunk husband, the children left to fend for themselves in the morning while their parents sleep off a hangover, the broken marriages caused by a drunk spouse giving in to their natural desire to feed the flesh. All of these are far from glamorous.
In John we read that the "Spirit of truth" dwells in the believer and as such we have a witness to help keep us on the right path. Our conscious is something science can't explain, but the Bible makes it clear.
The Spirit itself beareth witness with our spirit, that we are the children of God: - Rom 8:16 KJV
Be filled with the God's Spirit, not any of the worlds false spirits. You can only have that if you know Jesus as your personal Lord and savior. Do you have that relationship?