Hi, How are you?
Good how are things?
yeah. going good.
good to hear
How about the deal? 
Sure. My kids are really looking forward to this camping trip but one has special needs and he has to have a specific diet. I am fairly flexible on the water and firewood but food is a must have for me.
Okay. then I'll choose 2 food, 2 firewood and 1 water
You want two food or you're allowing me to have 2 food?
I want 2 food
My kids need the food. If you allow me to have two food I'll give you all the firewood
okay then I'll choose 1 food 3 firewood, and 2 water
It's a bit skewed towards you with all those items isn't it? If you want two waters then I'll need 3 food and one water. You can have all 3 firewood
Okay then I'll choose 0 food 3 firewood, and 2 water. you choose 3 food, 0 firewood and 1 water