Space is a difficult place to live and work.
There is no air to breathe, or water to drink. At first it seems that water is a simple enough matter, just take plenty along with you. The Russian module Zarya is packed with contingency water containers that were carried over from the Space Shuttle during assembly missions earlier this year. They look like duffle bags and each one holds about 90 lbs. The crew of the Space Station will do everything they can to save water.