Hi 🙂. What are you preferences regarding the items?
I am going to be going to the desert. I am going to be needing the water, since there is very little there
Oh I understand. I have a medical problem that causes me to perspire a lot and am a bit overweight so I was hoping to get some additional bottles.
I can understand the having the issue with perspiring since I will be in such a hot climate. 
How much food do you think you'll need? I'd like to get some additional food again due to medical issues (diabetes). 
 Yes. You will need food with that condition. You would not want your sugar to drop to low. 
Definitely. What about firewood? I don't think you would need a large amount being in the desert? I'm going camping but it rained recently so the wood would be pretty much useless for fire.
I will need the firewood for the desert, since it is so hard to find there. I would think 2 food and 2 water for you, would be a nice amount. That way you have your water and food. 
Thanks that's very generous of you. 🙂
Would you like to go with two water and two food for you. I will take one water, one food, and the 3 firewood.