Finish the following sentence with the best choice: To fertilizer plants for free

Choices:
- when you boil or steam some vegetables or eggs don't pour the water down the drain. Before the water has cooled pour it on your plants as fertilizer.
- when you boil or steam some vegetables or eggs don't pour the water down the drain. Once the water has cooled pour it on your plants as fertilizer.

Answer:
when you boil or steam some vegetables or eggs don't pour the water down the drain. Once the water has cooled pour it on your plants as fertilizer.