Of course! Here's a detailed plan for the science project "Investigating the Effect of Different Liquids on Plant Growth":

**Materials:**
1. Four small, identical plants (beans or radishes are easy to work with)
2. Four types of liquids: water, sugar water (you can dissolve 1 tablespoon of sugar in a cup of water), vinegar, and a soda of your choice.
3. Four identical containers or pots with drainage holes.
4. Soil to plant your seeds.
5. A notebook for recording observations.

**Procedure:**
1. Plant the seeds in four separate containers. Ensure that the amount of soil and the planting depth are the same in each container.
2. Label each pot with the type of liquid you will use: water, sugar water, vinegar, and soda.
3. Once the seeds are planted, water them with their respective liquids. Be sure to use the same amount of liquid for each plant.
4. Place the pots in a sunny location where they will receive equal amounts of light.
5. Continue to water the plants with their respective liquids once per day, always using the same amount.
6. Observe the plants each day and record any changes. Take note of leaf color, height, number of leaves, and overall health of the plants. 

**Analysis:**
After seven days, analyze your results. Which plant grew the tallest? Which one looks the healthiest? Do any of the plants show signs of poor health, such as yellow leaves or stunted growth? 

**Conclusion:**
Based on your observations, draw conclusions about the effect of different liquids on plant growth. Remember, this is a simple and short-term project, so the effects might not be drastic. However, you should be able to see some differences and make some initial conclusions about how different liquids can affect plant growth.

Remember, the goal of a science project is not just to get results, but to follow the scientific method, observe carefully, and draw reasonable conclusions based on your observations. Good luck!
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