Hello hope you are excited for the trip Im hoping we can discuss the supplies. I would like to get 2 water 1 food and 2 of the firewood 
I can give you 2 waters and 1 food, but I really need more firewood. I ran out last time and I don't want to go through that again! How about you take 2 waters, 1 food, and 1 firewood? 
I feel like we are almost there I hunt so im ok with the one food; why would  I only get one firewood?
I just want to make sure that I don't run out. I will have my kids with me and need to make sure they don't get too cold 🙂
Understandable I am an avid outdoorsmen; Starting firewood is hard and can also be dangerous; how about you give me the two I will only use one you get one and I will be able to secure more within a few hours. 
Are you sure that you would be able to get more firewood on your own?
Yes and as a return ill give you 70 percent of what I get-- So with me managing the firewood for you, you will get more time with the kids.
That's so nice of you! I would just feel more secure if I kept 2 of the firewood with me while you are out though, just in case of emergency. You wouldn't need it just for the few hours you would be gone. 
If that were the case I would need extra food since I would be behind trying to get more firewood..  
That makes sense. I would be willing to split the extra food package with you when you get back to camp. Then we would be even all the way around.