I don't think its possible to run out of calcium, but if you did you would probably have really fragile bones, or you could possibly die.
your organs would die
it would miy
everything would die out.
If you ran out of water, that would be disastrous. Cellular functions require water to operate, so you would die.
we will use salt
I would call an ambulance.
it would be very dry
New technology would be invented.
you would be president.
We would use another fuel.
you would need to get some more
It would supernova.