Well, in space their is no air, so we obviously air is the number on thing humans would need in space.
oxygen
oxygen...
We can not live with out trees
the suit of astronaut
The most important thing to think about is the amount of clothes you have and if you will be sharing the space with someone else. If you are female and have a spouse you will need more space than him and you also need space for shoes. In that case you may not need as many shelves and may use bins to store some of the excess.
soil
why do we need a pistol in space
The one thing humans need in order to grow is water.
dehydrated food
the hip bones curve out because the women need the space for the baby... its a female thing the hip bones curve out because the women need the space for the baby... its a female thing
The first animals were launched into space to see if it would be possible for them to survive in space at all. Once that was settled and humans went into space, there was no longer a need for space pets.
You do not need the space after the apostrophe (this ' thing) - "hors d'oeuvres".