If you are a Christin who takes seriously your obligation to spread the Gospel, then you will understand that whenever you run errands, your main objective is not on your errand, but on looking for opportunities to witness. Your errand is always your secondary objective.
Anytime you are going somewhere make sure you grab your keys, wallet, and tracts. This is the absolute minimum you should have with you when you are out and about.
This isn't some radical, new idea. The Bible tells us in Colossians 3:1-2:
"Since, then, you have been raised with Christ, set your hearts on things above, where Christ is seated at the right hand of God. Set your minds on things above, not on earthly things."
Even the great preacher, Charles Spurgeon stated, “When preaching and private talk are not available, you need to have a tract ready. . . Get good striking tracts, or none at all. But a touching gospel tract may be the seed of eternal life. Therefore, do not go out without your tracts.”
Click on this link for sources for Gospel Tracts. http://chipperchat.blogspot.com/2008/10/tracts.html