Finish the following sentence with the best choice: How can you prevent Dehydration when out of doors?

Choices:
- Carry at least a half Gallon of water (drink when hiking) for every 3 hours of outdoor hiking.
- Carry at least a half Gallon of sunscreen for every 3 hours of outdoor hiking.

Answer:
Carry at least a half Gallon of water (drink when hiking) for every 3 hours of outdoor hiking.