I suggest you draw three pictures;

1. Water diagram, indicating the position and direction of main drainage riser, toilet, floor drain and washbasin, the direction of water supply pipe and the position of valve faucet, indicating the diameter of the pipe in words, indicating the drainage pipe with dotted lines and water supply with solid lines.

2. Weak current diagram, indicating the position of weak current socket, line direction and installation elevation.

3. strong current diagram, indicating the position and elevation of the switch socket lamp distribution box, and drawing the direction and number of each circuit.

4. Text description is attached, such as whether the water supply pipe is installed or not.