First came news that there is water ice on Mars.
Then came news that the soil on Mars has the alkaline and mineral nutrient properties that can support plant growth.
Water to drink.
Water (H2O) to separate into hydrogen and oxygen.
Hydrogen and oxygen to recombine in a fuel cell to create electricity.
Hydrogen and oxygen to combine combustively for rocket fuel.
Nutritoinaly and PH friendly soil in which to grow plants that can take inhale carbon dioxide (the dominate element in Mars' atmosphere) and exhale oxygen (stuff we need to breathe).
Bottom line is, we can live on Mars.
We can take seed stock and basic materials and live off the land.
We can homestead Mars. We can terraform Mars.
As Ray Bradbury said in The Martian Chronicles, "We are the Martians".