When I was in the service (ARMY), we had what they called survival biscuits/hardtack or "pilot biscuits" in some field rations.
I remember that they were shelf stable, but hard as rocks and tasteless. That was in the late 60's, so maybe the newer versions are better?
I found these by Rich-moor, at the Campmor web site. I guess you could order a few different brands and do a taste test before you go.
(You need to Login or Register to view media files and links) These come 16 to a 7.5 oz bag, so depending on size of biscuit, I'm thinking you'd eat at least 2 of them with condiments?
I'm into the healthy eating thing, so the list of ingredients is a red flag for me, but everyone has different ideas on this.
I think Ranger was on to something with the flat bread idea? Or to be more specific, how about Whole Wheat Flour Tortillas?
I have some in my fridge, there salad plate size, very healthy and being stone ground whole wheat, there loaded with COMPLEX carbs for long term energy.
Figuring one tortilla per person, with condiments, They might be worth a look? Being flat, they will pack well, keep there shape and last for a couple of weeks, unless there in high heat.
I take these for lunch, I bring Venison sticks, one per tortilla and 2 small rounds of those wax covered cheeses, cut in half.
Le us know how your biscuit tests come out. Hopefully there better than I remember