It’s good that you recognize spirituality as warfare. St. Ignatius, who was a soldier before he became a priest, taught that there is a battle for our souls, and we have to use everything in God’s arsenal. Satan and his minions are against us, but we have the Hosts of Heaven on our side if we truly choose to call on them.
Sacramentals, and especially Holy Water, are powerful weapons against the Evil One, if used piously. Prayer and faith are great tools, and frequent Confession and reception of Holy Communion will be the strongest defenses for your soul.
Check out the spirituality forum for more info on the use of sacramentals and Holy Water. I can look for an exorcism that Pope Leo XIII authorized for use by the laity (an exorcism is not just for casting demons out of possessed persons, but for defense against the Evil One when he tempts you to sin). Read books by Father Amorth, the famous exorcist.