We need to teach people to walk in faith in the Holy Spirit.
As you stated:
Romans 14:17 For the kingdom of God is not meat and drink; but righteousness, and peace, and joy in the Holy Ghost.
Luke 17:20 Now when He was asked by the Pharisees when the kingdom of God would come, He answered them and said, “The kingdom of God does not come with observation; 21 nor will they say, ‘See here!’ or ‘See there!’ For indeed, the kingdom of God is within you.”
What things can we do to be in the Holy Spirit and invite him into our lives:
Baptism & Sacrament
Obeying the Commandments
Praying
Reading Scriptures
Attending a Church
Serving Others in Charity
Proclaiming the Gospel
Etc...
1 Corinthians 13:2 And though I have the gift of prophecy, and understand all mysteries and all knowledge, and though I have all faith, so that I could remove mountains, but have not love, I am nothing.
To live more perfectly we must be of the heart of the following:
Acts 4:32 Now the multitude of those who believed were of one heart and one soul; neither did anyone say that any of the things he possessed was his own, but they had all things in common. 33 And with great power the apostles gave witness to the resurrection of the Lord Jesus. And great grace was upon them all. 34 Nor was there anyone among them who lacked; for all who were possessors of lands or houses sold them, and brought the proceeds of the things that were sold, 35 and laid them at the apostles’ feet; and they distributed to each as anyone had need.
Perfect our love for God and our brothers and sisters and we will walk with the spirit.
Remember what is written about faith alone:
James 2:14 What does it profit, my brethren, if someone says he has faith but does not have works? Can faith save him? 15 If a brother or sister is naked and destitute of daily food, 16 and one of you says to them, “Depart in peace, be warmed and filled,” but you do not give them the things which are needed for the body, what does it profit? 17 Thus also faith by itself, if it does not have works, is dead.
Are we doing the works that the Father desires of us? We can feel the fruits of the Holy Spirit and know we are serving him and doing his will:
Galatians 5:22 But the fruit of the Spirit is love, joy, peace, longsuffering, kindness, goodness, faithfulness, 23 gentleness, self-control. Against such there is no law.
And by the following we know how we can be filled with the Holy Spirit which is the Kingdom, by doing the will of the Father:
Matthew 7:21-23 “Not everyone who says to Me, ‘Lord, Lord,’ shall enter the kingdom of heaven, but he who does the will of My Father in heaven. Many will say to Me in that day, ‘Lord, Lord, have we not prophesied in Your name, cast out demons in Your name, and done many wonders in Your name?’ And then I will declare to them, ‘I never knew you; depart from Me, you who practice lawlessness!’