He will supply it!
When the poor and needy seek water,
and there is none,
and their tongue faileth for thirst,
I the LORD will hear them, I the God of Israel will not forsake them.
I will open rivers in high places,
and fountains in the midst of the valleys:
I will make the wilderness a pool of water,
and the dry land springs of water.
Why would you turn to anything else???