Is a 3-wire copper ground or a solid copper wire required to ground a 200 amp electrical box?

Is this wireing correct:
A 3-wire copper ground wire in a conduit run from the electrical panel to the copper rod in the ground then to the cold water;

AND THEN IN THE GARAGE the naked 3-wire copper ground wire run from the hot water line on the hot water heater to the cold water line on the heater ;

THEN the 3-wire copper line from the cold water on the hot water heater to the gas line/