How to Make DIY Water Bottle Gravity Bong

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Craft your own bong with a plastic bottle

Co-authored by Aaron Justis

Last Updated: December 9, 2024 Approved

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Making the Bowl

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Making the Bong

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Using Your Gravity Bong

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Expert Interview

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Tips

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Things You'll Need

A gravity bong is a fun and unique way to smoke cannabis. It's also super easy to make yourself. With just a few common household items, you can quickly make your very own gravity bong — just make sure you're using it in a place where smoking is legal.

How do you make a gravity bong?

Take an empty plastic bottle, remove the cap, and cover the top with foil.
Poke holes in the foil and cut off the bottom of the bottle.
Find a plastic container that's a little bigger than the top of the bottle.
Fill this plastic container almost all the way with water.
Put the foil-covered plastic piece in the water and sprinkle weed on the foil.
Light the weed and slowly raise the foil-covered plastic from the water.
Remove the foil, put your mouth on the foil, and inhale the smoke.

Part 1

Part 1 of 3:

Making the Bowl

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1
Find an empty plastic bottle. An empty water bottle or liter of soda will work. You can use any size bottle, but keep in mind that the bigger the bottle, the bigger the gravity bong hits will be.^{[1]
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- If you're smoking alone, a small plastic bottle should work. You may want a large plastic bottle if you're smoking with multiple people.
- Make sure the bottle you use can fit inside a second, larger plastic bottle or a bucket.
Don't wrap the aluminum foil around the mouthpiece too tightly. You'll need to take it off later when you're smoking out of the gravity bong. The entire opening should be covered with the aluminum foil.^{[2]
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Use something thin to make the holes, like a toothpick or the end of a paper clip. Don't make too many holes or make the holes too big or the cannabis will fall down into the gravity bong. You just need a few holes so the smoke from the cannabis can travel down into the bottle.

Part 2

Part 2 of 3:

Making the Bong

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First, gently pierce the bottle with a knife around 1–2 inches (2.5–5.1 cm) from the bottom. Then, insert a pair of scissors into the slit you made and cut around the bottle in a straight line until the bottom comes off. Set the top of the bottle aside for now and recycle the bottom.^{[3]
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This is the container you'll fill with water. You can also use another plastic bottle that's bigger than the first one. If you do, just cut off the neck of the bottle so the rim is the same width as the body.^{[4]
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Cold or warm water is fine. You want to fill the container almost all the way up — leave 1–2 inches (2.5–5.1 cm) between the top of the water and the rim of the container.^{[5]
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Part 3

Part 3 of 3:

Using Your Gravity Bong

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The open bottom of the bottle should be at the bottom of the container, and the neck and mouthpiece of the bottle should be at the top above the water. If water is covering the mouthpiece, you're pushing the bottle too far down in the container.
2
Sprinkle ground up cannabis over the holes in the aluminum foil. You can break up the cannabis using your fingers, or grind it up using a grinder. Don't grind it up too much or the pieces could fall through the holes.^{[6]
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- Hold the plastic bottle steady with one hand as you're putting the cannabis on the foil so it doesn't fall off.
This will cause the bottle to fill up with smoke. Use one hand to hold the lighter and your other hand to lift up the bottle. Continue to hold the flame to the cannabis while you're lifting up the bottle.^{[7]
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Don't lift the bottle all the way out of the water or all the smoke will escape. At this point, the entire bottle should be filled with smoke.^{[8]
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When you remove the foil, some smoke might escape. That's OK — just don't push down on the bottle or you'll force all of the smoke out.
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Push down on the bottle slowly while inhaling. As you push the bottle down into the container, the smoke inside will be forced out and into your lungs. Don't push down too quickly or you could take in too much smoke. Keep inhaling and pushing down until all the smoke is out of the bottle.
- If you feel like you can't take in anymore smoke, take your mouth off the bottle.
If there's more smoke in the plastic bottle, you can take another hit or push down on the bottle to clear it. When you're ready to use your gravity bong again, put the aluminum foil back on, sprinkle more cannabis over it, and repeat!^{[9]
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Tips

Tips from our Readers

The advice in this section is based on the lived experiences of wikiHow readers like you. If you have a helpful tip you’d like to share on wikiHow, please submit it in the field below.

Make sure that the bottle is down when you add the weed; otherwise, you'll spill your weed into the water.
It is best to use hot water with a gravity bong. The steam makes your hit cleaner and better.

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