Hi, it is nice to be going camping. I do not have a very good sleeping bag and I can get cold at night. It would be nice to have extra firewood. I dont eat much so I do not need much extra food. Would you be willing to give me two packages of firewood for a package of food?
I enjoy camping as well. However, my campsite seems to be a bit chilly at night. I'd be willing to part with some firewood, yet I'd need quite a bit of food to compensate. I also have a stream nearby so water is plentiful if you need that as well.
I may be able to do something with regards to food. Do you have enough water?
I have more water than I need. How is your water supply?
I could use some more water as I get dehydrated easily. Since you have enough, I could give you and extra package of food for your water.
That sounds like a deal, what would you like to do as far as the firewood goes?
I really need to keep warm with my not so good sleeping bag.☹️ I would be willing to do this. I get two packages of firewood and three packages of water and I will give you two packages of food and one package of firewood. You have plenty of water so you will not miss that.. 
This sounds good to me, unless you would be able to part with three packages of food?
No, I would like to keep one for me just in case I need it. If it sounds good to you can we finalize the agreement and move on. I think we have something that helps us both.🙂
That works for me 🙂
Great! Thank you