Ingredients:

1 Large bucket (example or any available container)
1 Aquarium airline tubing - 12' ($1.49 per pack)
1 Aquarium 2-way valve (US$0.79 per pack)

Directions:

1. Here's all you need to get started.

2. Cut a section of the airline tubing and connect to both ends of the plastic valve.

3. As a test, I grabbed a pitcher filled with water. Here's the important part, to start the water flow, you need to place the pitcher higher than the plant. Put one end of the airline tubing in the pitcher, and the other end in the pot.

4. The dial on the valve is to control the water flow.  Use it to increase or decrease the amount of water the plant needs.

5. That's it! Here's a picture of the drip irrigation system at work.