From here on out you will be using only the top half of the bottle, so feel free to toss the bottom half in the recycling bin. Make the Bong (Photo by: Gina Coleman/Weedmaps) Step 2: Prepare the Bowl. First, you can use an actual downstem and bowl — the same kind of downstem and bowl combination you’d use in a regular bong. This route requires you to drill a hole into the lid of your plastic bottle.
Press the downstem into this hole and slide the bowl into the downstem. Prepare the Bowl (Photo by: Gina Coleman/Weedmaps) Tip: For best results, the hole you drill into the lid should be almost the exact same diameter as your downstem. When the downstem fits into the hole, it should be as airtight a fit as possible. Prepare the Bowl (Photo by: Gina Coleman/Weedmaps) Alternatively, you can make a DIY bowl using a piece of aluminum foil. For this option, take a square piece of foil and fold in half to give it a bit of thickness. Gently press down with your fingertip to create a slight depression in the foil. Next, use a paperclip, toothpick, or some other tool to poke several small holes in the foil. At this point, your bong, including downstem and bowl, is all ready to go and it’s time to fill your container with water.
Don’t fill it all the way to the top, as you will eventually push the plastic bottle down into the water and you want to avoid spilling. Fill a Bucket With Water (Photo by: Gina Coleman/Weedmaps) Step 4: Get Ready to Smoke. You’re almost ready to spark up and take your first hit. Start the process by packing your bowl with a pinch of ground-up cannabis. Next, hold the gravity bong in one hand and gently push it down into the water. Get Ready to Smoke (Photo by: Gina Coleman/Weedmaps) Step 5: Light Your Herb. Keeping the gravity bong submerged in the water, use a lighter or hemp wick to ignite the cannabis. As it produces smoke, slowly and smoothly begin lifting the bottle up out of the water. This creates a vacuum that sucks the smoke down out of the bowl and into the empty bottle. Light Your Herb (Photo by: Gina Coleman/Weedmaps) IMPORTANT: DO NOT LIFT THE BOTTLE ALL THE WAY OUT OF THE WATER OR YOU’LL LOSE ALL YOUR SMOKE! Lift the bottle up enough that it pulls all the smoke down into the bottle but does not fully emerge from the water. With the bottle now full of smoke, remove the downstem and bowl and place your mouth over the bottle opening. Gently and slowly push the bottle back down into the water. This will force the smoke up out of the bottle and into your lungs. If you don’t want to clear the entire bottle at once, continue holding it in the water and put the downstem/bowl back on top to trap the smoke. Inhale (Photo by: Gina Coleman/Weedmaps) Gravity Bong Method 2: Waterfall Bong. The waterfall bong is a slightly simpler method requiring fewer components. Here’s how to make and use a waterfall gravity bong. To make a waterfall gravity bong, you will need the following: Empty plastic bottle Scissors or box cutter Downstem and bowl, or alternatively, aluminum foil Water. Begin by cutting a small hole in the bottom of the plastic bottle. It should be large enough to allow water to flow out of easily, but small enough to cover with your finger. As with the bucket bong version, you have two options to create a bowl for your gravity bong. To use an actual downstem and bowl, you will need to drill a hole into the lid of your plastic bottle. Press the downstem into this hole then slide the bowl into the downstem.
Again, the hole you drill into the lid should be almost the exact same diameter as your downstem to keep things airtight. You can make a bowl using a piece of aluminum foil. Fold a square piece of foil and place it over the top of the empty bottle. Gently press down with your fingertips to create a slight bowl shape and use a paperclip, toothpick, or some other tool to poke several small holes in the foil. Remove the downstem/bowl combination and put your finger over the hole in the bottom of the bottle. Hold your finger over the hole in the bottle to avoid spilling any water.
Now, put your downstem/bowl combination back onto the top of the bottle and pack it with a pinch of ground-up marijuana.