Hello. I have a large family going camping - there's 17 of us! How big is your group?
Wow that is a large group.  I assume that is more than just your immediate family.  I will be bringing my husband and five children.  
I see! We don't have a great need for firewood. Water isn't a big deal, either. We're going to need quite a bit of food.
Yes, sure sounds like it!  I will gladly let you have 2 extra packages of food and only take one for myself.  How would you feel about that?
We might make that work. If I gave you all the firewood, could you let us have 2 of the food packages and 2 waters? Hopefully that's fair for you, your hubby, and the 5 kids.
That sounds good to me.  Do you go camping frequently?  
Yeah, we try to get out with nature at least monthly! Been harder lately with the pandemic and all.
I hear you.  We like to go camping a lot too but my youngest is only 15 months old so it has been harder this past year.
I see. So let's recap what we talked about a bit. I'll send you 3 firewood packages. I also send 1 food and 1 water. The rest will be for our big fam!
Yes, great, thank you!
OK, sounds good. I'll arrange the amounts now if that's okay with your bunch.