Hello, how are you?
Hi, I'm well thanks for asking. I'm just trying to get this camping situation sorted out. How are you?
I'm good.  Yeah, me too.  I have a big group heading out and we could use some extra supplies.
Same here. It looks like a nice place with great facilities. I'm just worried about having enough food because I am diabetic and have low blood sugar. 
I'm sorry to hear that ☹️.  Well I'm sure we could work out some kind of deal that leaves us both happy.
I was hoping you'd be open to some ideas. I have great camping equipment so I'm not too concerned with building bonfires. The only thing I can't really prepare for is my blood sugar intake as it varies especially at high elevations. I'm interested in having food on hand, but would love to lend you some firewood.
OK, how about I take 2 water, 2 firewood, and 1, and you take 1 water, 1 firewood, and 2 food?  
I really appreciate your kindness on understanding my problem. But because of my diabetes I get thirsty a lot. What about I get 2 food, 2 water, and 1 firewood? Would that work for you? You seem confident and don't really have any stressors regarding your trip.
We have a pretty big group and it's looks like its going to be hot during the day and pretty chilly at night so I could definitely use the extra firewood.  Maybe I could take one water, 3 firewood, and 1 food?
Oh the weather looks really hot during the day. I'm excited to fish and we have all the gear for the cold night. The chilly night wont be a problem for us so I am happy to share all the firewood you need.