Sorry for not getting back until now, but I'm ready to continue!
I don't think 200 is much to ask for. It's not only food for 10 days, but equipment to protect you from the desert environment (I did adjust for the warforged not needing to eat or drink). You each started with three magic items and 840 gp, so 40 each is only a few drops in the bucket (if you didn't start with that, I'm sorry for being unclear! You can go ahead and put those on your character sheet). If it helps make more sense, we can use a silver standard instead of gold, like I do in my other games. I just didn't want to confuse everybody so I left it out of this.