Hello.  I really would like two packages of extra food, one water, and one firewood.  How does this sound to you?
Hello. I would like 3 packages of water, 2 firewood, and 1 food. 
I would really like one of the waters.  Could we come to a deal with you getting 2 waters, 2 firewood and 1 food?
I am agreeable to that. I can compromise by giving you a water.
Thanks. I thought extra food was the most important when camping
Well in my case I wanted water most because I bring more food. And I like the firewood for cooking and I love campfires 🙂
Campfires are great, I only need a small one though.
Good. Then it seems we can help each other out for mutual benefit
Exactly, it is so nice when negotiations go smoothly.
I agree. Thank you for being reasonable. 
Thank you!  Have a great camping trip 🙂