Just to add - Carrying period rations is not hard. For example:
Or, you can buy a set from places such as:
http://reprorations.com/Germany%20WW2/WW2-Germany.htm
You name it, there is a reproduction label for it. I usually carry stew, sausage, cheese, perhaps some jam, bread or knackbrot (type of German hard bread) etc... It's very easy to carry everything period, especially with the amount of labels kicking around out there.