Step 1: Materials You'll Need
• Two 2-liter plastic bottles
• One smaller plastic bottle, between 591 mL to 700 mL in size. Get one that has five bumps on the bottom (like the 2-liter bottles, as shown in the close-up picture above).
• One “Tornado Tube.” These are used to hook two plastic bottles together and are often found in toy stores. They can also be purchased online, such as from Amazon.com: http://www.amazon.com/dp/B000GYSZOI/
• Optional: Hair dryer and Goo Gone to clean the bottles up.
• Utility knife
• Epoxy that works with plastics. I used quick-set, multi-purpose Loctite epoxy and it worked great.
• Funnel or construction paper
• Optional: Grass/grass seeds, small leaves, rocks, twigs, etc., to make a natural foraging area for the ants.
• Shipping tape
• Cotton ball
Step 2: Clean Up the Bottles
Tip: To more cleanly remove the labels, use a hair dryer for a few seconds on the parts that are attached to the bottles with glue – this will melt the glue. If there is a little glue residue left, use a product like Goo Gone to remove it.
Step 3: Cut Up the 2-Liter Bottles
You can use the utility knife to make an initial cut, and then use scissors to do the rest of the cutting.
Tip: On one of the bottles, you may want to make a small, triangular notch so it’s easier to figure out how to put the bottle back together later.
Step 4: Secure the Small Bottle Inside of a 2-Liter Bottle
Since the small bottle has five bumps on its bottom, it should nicely fit in place inside the bumps of the large, 2-liter bottle bottom.
Step 5: Seal the 2-Liter Bottle Around the Small Bottle
Tip: If you made a triangular notch on the 2-Liter bottle, line up the notches.
Use the epoxy to seal the 2-Liter bottle back together. You do not want any big holes that the ants could escape through, so it may take about four or five rounds of applying epoxy and letting it set before you’ve sealed all the cracks. Try not to add too much epoxy in one area at once or you’ll end up with solidified globs.
Tip: Gently blow through the top of the bottle to see if there are any cracks left that need to be sealed up. Listen for air escaping, and use your hand to feel where the air flow is coming from.
Step 6: Add the Soil
Tip: Make sure there is soil all the way up to the top of the bottle so that the ants don’t encounter a “drop off” when they dig their way down there.
Step 7: Make a Foraging Area on Top
Fill the top 2-Liter bottle with some soil (just up to where the bottle widens to its largest diameter). Then, if you want, you can add some grass/grass seeds, small leaves, rocks, twigs, etc., to make a natural foraging area for the ants. You should also add a little water since ants prefer semi-moist soil.
Step 8: Finishing Touches
This should seal the top of the ant farm pretty well, but if you’re concerned about ants escaping, do the following: Use the utility knife to make small hole in the top (such as in one of the five bumps), push a cotton ball into the hole (so the ants get filtered, fresh air), and then seal the bottom onto the bottle using shipping tape.
Step 9: Add the Ants!
Step 10: Possible Additions/Variations
Make multiple ant farms like this one and connect them together using small, clear plastic tubing. It’d probably be best to connect them in the upper bottle, right at the top of the soil level.
Make it Glow!
You could try drilling a hole in the bottom of the ant farm, through both the smaller and larger bottles, and inserting an LED into the inside, smaller bottle. By doing this you could make the ant farm glow from the inside! (You’ll want to be sure to seal area around the hole with epoxy so that soil/ants don’t escape there.)