This is a gravity-based water dispenser. When the water bottle is placed upside down, gravity pushes water toward the straw pipe.
Opening the cap slightly allows air to enter, and water flows out through the straw into the glass.
This demonstrates how gravity and air pressure can be used to dispense water without electricity or motors — like in basic water coolers or hand wash dispensers.
Materials Needed
- 1-liter plastic bottle (with cap)
- 1 straw pipe (straight one, or with a bend)
- A glass or small paper cup (to collect the water)
- Cardboard (for base and support)
- Cutter/scissors
- Glue or tape
- Small piece of balloon or cling film (optional valve flap)
- Marker (for marking holes)
How to Make It Water Dispenser Working Model (DIY without motor)
Step 1: Prepare the Bottle
- Take an empty plastic bottle, fill it with water, and tighten the cap.
- Make a small hole on the side of the bottle (1–2 cm above the base) to insert the straw.
- Insert the straw into this hole so it fits snugly. Seal it with glue or tape to avoid leakage.
Step 2: Make the Base and Stand
- Use cardboard to create a vertical stand that can hold the bottle upside down (like a water cooler).
- Cut a round hole in the cardboard to insert the bottle’s neck downward if needed.
- Fix the bottle on the stand using tape or rubber bands.
Step 3: Create a Gravity Valve (Optional)
- For added realism, add a valve concept using a small piece of balloon or plastic flap at the straw end to temporarily block flow.
- You can press the straw down lightly or tilt the glass to release water.
Step 4: Testing
- Place a glass or cup below the straw.
- Loosen the bottle cap just a little (this allows air to enter).
- Water will start flowing out of the straw only when the air enters, simulating a real gravity-based dispenser.