This is giving away free mineral water to people but the Gospel message is printed on the package or on the bottle of mineral water. The Gospel message is presented relevantly through the water that can quench thirst however the message is more than just quenching physical thirst but spiritual thirst[salvation] as well. You don’t just help the people physically but spiritually. I call this “Bottled Water Tracts.”
You can give this in any events- race, concerts, sports or rally. And you can incorporate this in your evangelism as you use the bottled water tract instead of the usual gospel tract to present the Gospel.

-Art Roy Remy