Summarize the following:
It's likely that glass dust or other residue might have gotten into the bottle during the drilling process. Rinse the new bong out thoroughly, including around the sealed drill hole, to make it safe to use. Glass dust is especially hazardous to breathe or ingest, and it only takes a few moments to clean your new bong. Don't skip this step. If you want, you can now add some pizzazz to your bong. Apply stickers or decals, etch your name into the glass or draw on the bottle with paint pens. Personalizing your homemade bong will make it stand out even more, which is a great touch if you choose to display it or give it as a gift. Fill your new bong up with water past the bottom of the stem. Drawing in the smoke through the water turns the smoke you inhale to a smooth vapor and allows for a less harsh smoking experience. Place your favorite smoking product in the bowl and you're ready to go!
Clean the bottle again. Customize your bong. Prepare the bong for use.