How many of each extra package are you thinking you need?
I would prefer to take all of the firewood, split the food, and you could have all of the water.  What do you need the most?
Splitting the food is what I was thinking as well, but I'd also like to split the firewood. We can split the water or I'm fine taking all of that.
I would be willing to take 2 firewood, 3 food, and 1 water if that would work for you.  
Hmm I think I should take 2 food, 1 firewood, and 3 water. What do you think?
Is your first priority the water?  I'm definitely willing to split up by what is most important to us both.
Food is actually my first priority but since it seems to be first priority for us both I thought we could split that. Water doesn't seem to be a priority for you so thought I could take that
My first priority is actually firewood.  Food is my second.  🙂
Okay so would 2 firewood for you and 1 for me work, and 2 food for me and 1 for you?
I can definitely agree to that.  What was your second preference?  Water was my third.
firewood is my second preference and water is my third
Well, water doesn't benefit either of us much, so you can have two. So you will take 2 food, 1 firewood and 2 water?
Yes that sounds good to me