God's Secret Recipe

This evening we spent some time riding our bikes, getting some fresh air and a little sweaty. Upon arriving home Gwyneth got two little cups of water from the faucet. One for her, one for me.
She proceeded to ask:"How do you make water?"
I said:"You don't. No one can make water. It has always been around. God gave it to us."
She said:"Hmmm...it must be God's secret recipe."