WW2 in Britain (also the US and Canada) had Victory Gardens where public spaces and private lands and yards were planted with seasonal crops to help with the food supply, so rations regarding to type (i.e. only subsisting on porridge or potatoes and onions) was not necessarily the case. We had family in England and care packages were always sent at regular intervals with things that were scarce for them like meat, butter and eggs. I also don't see how WW2 rations would really have any relevance to too many people any more.
I have seen (as stated previously) various other poverty awareness initiatives like "Can You Live on $4.00 a Day?" which would imo be more relevant to today.