Is it necessary to use glass glue for the installation of squatting in the bathroom of the bungalow?

You can do without. At the water inlet, put the connecting rubber plug into the water inlet hole of the squatting toilet and snap it tightly. Coat a layer of glass glue or putty on the outer edge of the contact with the water inlet hole of the squatting toilet, insert the water inlet pipe into the water inlet hole of the rubber plug to make it well sealed with the rubber plug to prevent water leakage, coat the edge of the water outlet of the squatting toilet with a collapsing layer of glass glue or putty, put it into the inlet of the sewer pipe and screw it, and set the toilet horizontally with coke slag or other fillers.

After checking that there is no water leakage at each joint, fill the toilet with filler, and fill the contact surface between the ceramic and cement mortar with an elastic material such as asphalt or linoleum of more than 1cm.