Anyway you could make up a batch of Granola, recipe here in the forum, take tins of coconut milk with you, this would sort your low carb breakfast, depends where you go camping, you might be able to pick berries somewhere close by?
I just googled low carb camping and there are loads of pages, see if there is anything that works for you.
Not sure about Austria, all I remember is their pastries, gateau and dumplings, but things might have changed a little since my visit there in the 80s.
Oh hold on, friends of ours went camping in Austria, a farm was up the road selling home cured meats and sausages and vegetables and eggs and cheese amongst other goodies, apparently such farms are all over the place.
I hope you have a wonderful, relaxing holiday and of course lots of fun x x