What conditions do humans need to survive on Mars?

Humans want to survive on Mars for a long time, first of all, water. There is no stable liquid water on Mars, so there is no way to grow plants there. As can be seen from the aerial photos, the entire surface of Mars is basically composed of desert and gravel, and there are also many sandstorms. It can also be proved that although it has oxygen, it is absolutely thin. In addition, both poles of Mars are polar caps composed of water ice and dry ice, so it should be very cold on Mars. Although humans can use scientific means to melt the ice at the poles of Mars into water, Mars is only half the size of the earth. What will happen after the poles melt is incalculable, or even worse. With stable liquid water, plants can grow and plants can have oxygen. With enough oxygen, everything can grow. Therefore, it is not unreasonable to say that water is the source of life.