How do I keep from dehydrating?

Hint 1 of 7:

Think about this.

Hint 2 of 7:

You need water, of course.

Hint 3 of 7:

Drinking from the Nile will solve your problem temporarily.

Hint 4 of 7:

However, you'll need something to take the water with you.

Hint 5 of 7:

Like a canteen.

Hint 6 of 7:

Get the canteen from the knapsack.

Hint 7 of 7:

Open it, fill it with water from the Nile, and close it.