Hi! Which items are important to you?
Food is the most important to me because I need to eat more often so that I can take my medications.  
Yeah, that is important. I do not have a problem letting you have more food than me.
Would it be possible to get an extra water also?  How do you feel about the firewood?  I wish we could split everything evenly.🙂
Me too. Firewood is the most important thing to me. We will be somewhere cold and we could use the extra warmth.
True.  How about I get 2 food, 2 water and 1 firewood. And that will leave you with 2 firewood, 1 water, and 1 food? 
What do you need the extra water for?
With the extra food I need I will need extra water also.  How about I only take 1 extra water?  
So are you okay with you getting 2 food, 1 water, and 1 firewood and me getting 1 food, 2 water and 2 firewood? I'll do that deal.
That should work.  I will conserve with my water and I should be fine.  So we have a deal?