Prepare the Lava Mixture: In a bowl, combine the warm water, dishwashing liquid, white vinegar, and red food coloring. Stir gently and pour this mixture into the empty plastic bottle.
Make the Baking Soda Solution: In a separate container, add the baking soda to the ½ cup of cold water. Mix well until fully combined.
Erupt the Volcano: Pour the baking soda mixture into the vinegar mixture in the bottle. Step back and watch your volcano erupt with bubbly, colorful lava!