We are bringing an air mattress, will there be a place to blow it up through an outlet? Also, is there a water source there?

You will need to bring a pump

There is no power, you will need a rechargeable pump or one that plugs into your car. There is only water to wash your hands, you cant consume it.

The general store has water and there is water by the porta potties for washing hands and dishes. Thers no electricity, use your car or bring battery power