Take a bottle or jar, fill it partially with water, and insert a downstem or tube for airflow. Attach a bowl to hold cannabis. Ensure airtight seals to maintain suction. Light the herb while inhaling, drawing smoke through water for cooling and filtration. Avoid materials that release toxins when heated. Homemade bongs are customisable and effective for smooth hits, but must be cleane... https://www.olivastu.com/how-to-make-a-bong-without-a-stem