We can get water out of our waste. We do that by filtering our waste and then watering our plants with it. Not only does it help with getting fresh water, but it also helps the plant grow. The plants give off water vapor that has been naturally filtered. Then we'll filter it again and it's clean enough.
Exercise is very important on Mars because of the gravity.
When the astronauts back to Earth from space their bodies are not use to the gravity and they would not be able to walk. To exercise in space they have a treadmill and other machines to keep them in shape. One of the energy sources is a windmill. With the wind on Mars the windmills contribute energy into all of the biodome. Another energy source is the solar pannel.