He placed the letters into the water in the dish and prayed over them. At that moment the water in it turned to blood. Previously the man did several of the stunning “miracles” in front of his congregation and won their respect.
However, no video of the marvelous deeds was taken for us to see and witness the miracles and signs. It is possible the man fooled people by doing some kind of chemical trick with the water. For instance one can use Phenolphthalein to mix it with the water and turn it red, looking like wine or blood.
It’s a simple scientific trick, and some “prophets” use them to impress the people. Surely, God does miracles, but He is not a clown in the circus, and true signs are not meant to entertain the church.