Hello
Hi can I ask what camping supplies you most need?
I would like the 3 food packages because my sister forgot to pack any food items for the trip. You can have all the water and firewood. 
Oh no!  I have my daughter with me and she really likes to eat.  I was hoping to get at least some of the food.  Do you need water or firewood more?
I'm sure we can come to some compromise. I know my sister and I want to make s'mores in the evening. How about I get 2 food and 1 firewood, 1 water and you get the rest? 
I love s'mores.  Food is my number one concern though.  If I'm only getting 1 of the food I really need all of the water.  How does that sound?
So I get only 3 packages? 2 food and 1 firewood? 
Do you need more firewood?  I could compromise there.
How about I get 2 food and 2 firewood? You can get all the water plus 1 food and 1 firewood? 
Yes that sounds fair.  Deal.