Water ice is ubiquitous at high latitudes on Mars in the form of permafrost and surface deposits. There are even liquid water lakes under the polar ice caps. However, high latitudes are not ideal for human settlement due to low temperatures and dearth of sunlight.
A new map of subsurface ice produced from multiple orbital datasets indicates it is plentiful at mid-latitudes.
There are also a few hints of accessible ice at equatorial latitudes from neutron counts and slope streaks.
The current plan is to directly confirm the presence of subsurface ice at prospective landing site(s) by robotic Starship missions prior to sending humans.
These Wikipedia articles provide some additional information:
Everything that could be useful to humans -- from water and mineral ores to solar and wind energy.
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