i wouldn't be too concerned about exact measurements.
when making bannock in the field i work on this principle:
How many people am i making it for and how large do i want each portion to be?
Then i use ANY measure to hand (and on occasions that has been my hand
) usually that is my lightweight mug. 1 full cup flour to half a cup of water, throw in any fruit,berries or anything i've brought with me and away i go. That is enough for me and i multiply that according to how many are with me.
Experimentation is the key, Maybe consider making one at home using exact measurements so you know what the consistancy of the dough feels like. Then you have an idea of what you should be aiming for in the field when you've left your kitchen scales at home
As long as it is edible there isn't really a wrong way to make it. It's down to trial and error and personal preference.
Good luck and let us know how you get on