Ok, so NASA needs to buy a construction company. Then, we get a space rocket, fill it with construction materials. Fill it with guys who work in construction. Then they build as much of a warehouse as they can before their oxygen tanks run out. Then they come back to earth. Replace the oxygen tanks, and send another rocket with more construction materials, and keep building that warehouse.
Then keep doing that until they're done building the warehouse. Now, the next trip there they can ship them with tons of oxygen tanks instead of construction materials.
So now they can stay up there longer than a few days. Now they can ship another rocket with construction materials, and food, and supplies.
And when it gets there, now we have a warehouse to store all of it. And now they can start building houses. And they can bring plants to create oxygen. Bring some trees to plant.
Now you have roads, and houses, and empty communities. So if you don't like earth, you can leave.
...........I just need to figure out a way to create water on the moon.
You don't need oxygen tanks, you need an oxygen generator. There is water on the moon, separate it into hydrogen and oxygen.
https://www.astronomy.com/science/the-moon-has-less-water-than-we-thought/
https://www.energy.gov/eere/fuelcells/hydrogen-production-electrolysis