Hi. I hope you are enjoying the camping trip.
Hi 🙂 So far I am! What about you?
I am doing great only that i need to add a few items.
Same here! Which item(s) are most important to you?
Food is the most important. I will not give it up for anything. What about you?
I could use food, too. However, I'd consider giving up some food in exchange for other items. I could probably spread out my food ration if I got more of other items.
Okay then . Let me present you my offer. I take 3 food, 2 firewood and 1 water.
Wow, that's really not a good deal ☹️ If you get all the food then I would request 3 firewood and 3 water to even it out. Food is most important to both of us.
I think it is a good deal. 
It isn't. You're getting more items and all 3 of the highest value items. I would walk away rather than taking that deal.
What do you propose? Walking away is not really a good thing. I believe we can agree. I really need the firewood. Please be kind to me.
I need the firewood as well. You're getting more of our highest items, so I get more items overall. You get all 3 food, but I get 5 items and you get 4. It's the fairest deal. I am not going to be ripped off and will walk away if need be.
You haven't changed your deal at all. Is that how we negotiate?
I've offered you my fairest deal. I can make one change and that would be I get one food given to me and I'll give you one firewood.  You're wasting my time now. Last chance or I walk.
Present your last offer
Walk-Away