Hi, how is your trip going? hopefully better than mine
My trip is going pretty so so too  im sorry to hear that about yours!! sounds like we both are gonna need some extra stuff? I was wondering if we could start with the water? any chance i could have it all and you can have all of something else? thoughts? im open to discussion
I am actually very much in need of water. I fell while I was hiking during this trip. I have a really bad wound I need to clean on my leg. 
yikes that stinks. i got some extra people with me and we dont hve enough either. could i take 2 since we will be drinking it and maybe you can have 1 to get that wound cleaned up
There is a lot of blood on my wound and if I don't get it cleaned I am afraid I would have to have it amputated. It's likely I'll be stationary a long time. Maybe I can give you 2 water in exchange for 2 foods since I'll be stuck up here for a long time? 
oh no!!!!! sounds like you shouldnt be camping at all. thats insane that happened. youre definitely in my thoughts. uhm i guess i have no choice since your situation is dire. so to be clear youre saying i can have two water and you can have two wood? if so thats ok with me
I would give you 2 water in exchange for 2 of your food supplies
im sorry i mistyped. okay yes thats a deal. so last we have to talk about the wood. what do you think
Oh yes, sorry I am so caught up with my wound I completely forgot about that. I can spare 1 firewood so you would get 2, do you think you could spare another water in exchange for the wood?
i cant unfortunately i really need the two water im sorry.  im so sorrry unfortunately i am in dire need of two wood we are in a very cold climate
how about i get 1 water, 2 food, and 2 firewood since I'll be here so long? because of my leg i likely won't be able to leave anytime soon What about I give you more food in exchange for you giving me more water? I could give you 2 food and you give me an extra water?
unfortunately that doesnt work for me. i am afraid i will not be able to discuss this any further my final offer is i get 2water 2food and 1wood
can we meet in the middle? if we cannot come to an agreement we both get nothing and we both lose. i am in dire need of the water to keep my leg from having to be amputated. i have children at home i take care of and i can't live without my leg