On the subject of water and POTUS and FLOTUS covering their water.
In the Bible water is symbolic of a few things. The most obvious thing it is symbolic of though is life. Jesus is the living water by which we can attain eternal life. Water is also tied inestricably to baptism. And baptism is a must for forgiveness of sin. A person must be born of water and Spirit to get to heaven according to Jesus.
So, by covering the water are POTUS and FLOTUS saying, No forgiveness for you? Is that why both POTUS and Pence took water off the table at the one meeting?
I wouldn't swear to it, but it seems pretty logical to me.