Hi, I didn't bring enough food with me. Can I take all three packages of food? You can take as much water as you need.
Hi! I'm sorry to hear about the food. You can have all of the food, but in exchange, can I have all of the firewood? It's going to be freezing out, and without all of that wood to burn, my family might get hypothermia.
I would like at least one of the firewood bundles. You can have all of the water and I can boil some from the river. Does that work with you? 
That would only work if I can take 1 of the food. I'm doing a ton of hiking, and I'm going to need to fight off starvation. You can have the rest of the food, though. Does that work?
That sounds okay with me, but I would like one of the waters in exchange. 
Okay, I can work with that. So you'll take 2 foods, 1 firewood, 1 water, and I'll take 1 food, 2 firewood, and 2 waters?
That sounds good to me 🙂
Wonderful! That was simpler than expected. Would you like to put in the trade, or shall I?
Thank you for compromising. I hope you have a great time camping! You can enter the deal whenever you are ready. 
I appreciate you compromising, too, and I hope you have a great time camping as well! Feel free to put in the trade yourself, otherwise, you can send it back to me and I'll do it. 🙂