It's so good to be talking to you before this historic camping trip we're all going to be going on. You're gonna love it. But before we go, we need to figure out the best deal for everybody, and that's what I want. I want all of us to win. Tell me, what do you need most in the world? I'm gonna get that for you.
That would be awesome! I really need some more water. I need it so that I can take my medications with it. It's very important to me. To get this, I'm willing to give you as much firewood as you need. How does that sound to you?
That's tough, real tough. Everybody wants you to be able to take your medicine, and it wold be terrific if you could, but everyone has to make sacrifices for the greater good. I need ALL of the water. Non negotiable. That sounds tough, I know, but I'm ready to give you the deal of a life time for it. A deal you've never seen before and won't see again. I'll take all the water, it's true, but in return I'm offering you two wood and ALL THE FOOD. A dynamite deal.
Oh wow. That is tough. That is a good deal. May I ask - why do you need the water? 
The world is a scary place out there, it's getting tougher for us regular people to get by, especially with companies dumping chemicals in our water supplies, poisoning us. I'm pledging to my camping group, we're gonna have the cleanest water around. So clean they won't believe it. Frankly even I don't believe it and I'm seeing it with my own eyes. They're gonna love it.
I think that's a very noble cause. Maybe other people in our camping group can supply some water? I'd be more than happy to give you two waters, and I will take just 1 water for myself, even though I need it very badly for my health. 
You're making this tough for me. Real tough. I'm not a bad guy though. I'm willing to help the people even if I don't agree wit them. It's going to cost you though. If you get one water, I'm going to need two wood. You scratch my back, I scratch yours. Everybody gets the best deal. You're making out like a bandit with all the food. That'll be terrific for you.
How important is the wood to you? Ideally, how many would you need?
If you're getting one water, I have to have two wood. I'm already breaking my pledge not to negotiate on the water. That's huge. I have to come out of this looking strong for my people. They're not going to like seeing me break on such a big pledge I made. You get one water, one wood and three food. That'll be big for you, getting the entire stack like that. Huge!
I think this is a fair proposal... I'll be willing to give up two of my wood (even though it is very high priority) since you are generous enough to give me a water.