Hello, Do you think I could have all firewood, water and food? I have 6 students do camping with me tonight.
Sorry but my family and I (my partner and 3 children) are going on a hike so we would need more supplies. How about instead you take all the water and we take all the firewood and food?
What is your priority for this supplies?
I think we mostly need firewood, but we're also a bit short on food since the hike is nearly twice as long as we anticipated. What supplies do you need?
We do need firewood the most and some of water and a bit of food.
Sounds like a pickle we find ourselves in. How about this, I take all 3 packages of firewood and compromise by giving you all 3 packages of the water, and also give you 1 package of food. 
How about you can have 1 water, 1 firewood, 1 food and we will have 2 firewood, 2 water and 2 food?
I fear we may not come to an agreement as this rate ☹️ My hike will be up a very open mountain so if we are to start and maintain a fire we really need a lot of wood otherwise the winds will really just tear it down and we'll freeze. You said you were bringing 6 students so I think water and food is most important for you. So here's a good deal, how about we take all of the firewood and 1 package of food, and you take 2 packages of food and all the water?
We must have firewood for our camping as our students need light from firewood to cook our food and do activity in the camp. 
I'm willing to swap 1 of the firewood packages for 1 of the food packages then. Gonna need energy for that hike.
How about we take 2 firewood and 3 water and you can have all food and 1 firewood?
I'm afraid I need at least 2 firewood packages otherwise the winds won't let us even start the fire much less maintain one. How about we take 2 firewood, 1 food, and 1 water?
okay. we would do this deal.
Alright great, it's a deal then! 🙂