Extraterrestrial Beings

As stated a couple of post ago the earth is going to die. We have anywhere from now to two billion years before that happens. So we need to start making our moving plans because our house and it's heater is getting old. So the first thing we need to talk about is space station or colony? I answer Space station because I believe that the environmental factors of an alien planet are much riskier than a self made space station of the future would. Also if the First order can make a movable solar system destroying planet, than why can we not make a habitable, movable space station ( maybe because that is a movie where magical monks kill people with laser swords). So humans need things in order to survive, so here those things are as well as how i think my Space station would  address them. First is oxygen which is quite simple Trees, with a sustainable atmosphere that we have in subs and some Co2 scrubbers for good measure. Next is water which since my design is to model earth as much as possible we will artificially create a "sun" that will help us utilize the water cycle with the resources that we have left on earth, or we could convert the pee of our citizens into water. Next is food which we would just set up farms and use seeds and the resources we have discussed already. Another thing is meteors which the "moon" has defense mechanisms once a meteor is found inbound. And finally ( and this is what the purple party hats on the space station and it's moon) a way to get an axial spin and a magnetic field and artificial gravity is make one using the resources of the future that could artificially create these things. And if we ever need resupply that is what the rest of universe is for.
note you will have to move the picture to see the model
another thing the gray things on the side are thrusters that would hopefully be used to move the station.
Notes: https://docs.google.com/document/d/1SymLU9NkgITTlJAfQRiwZVywFbdXjVvBRhuQ-CTiEq0/edit?usp=sharing