Finish the following sentence with the best choice: To save on buying water,

Choices:
- use a rain catcher such as a barrel and route the roof gutters to it, then purify the collected water.
- use a rain catcher such as a barrel and route the roof gutters to it, then drink the collected water.

Answer:
use a rain catcher such as a barrel and route the roof gutters to it, then purify the collected water.