Ok. Just get him used to the backpack before hand. He can carry his own water and food.
As for the fire, if you find out let me know. My last GSD grabbed a flaming log and took off through the woods with it, to greet sone new comers.
I would bet, if you hike him before hand, he will relax at night. Maybe not this first time, but he will get used to it.
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