If we were to write a claim evidence reasoning statement to answer the question "In which temperature water did the food coloring spread faster?", it would look something like this: 

Claim: The food coloring spread faster in hot water than it did in cold water.

Evidence: In hot water, food coloring took X seconds to hit the walls of the container. In cold water, food coloring took X seconds to hit the walls of the container.

Reasoning: Hot particles move faster than cold particles. As temperature increases, so does the speed of particle movement.