To find out how much water Aiden pours into each container, you divide the total amount of water by the number of containers:
\[ \text{Water per container} = \frac{\text{Total water}}{\text{Number of containers}} = \frac{72 \text{ cups}}{8} \]
Calculating that gives:
\[ \frac{72}{8} = 9 \text{ cups} \]
So, Aiden pours 9 cups of water into each container.