Budget food/living

There is nothing complicated/mysterious about organic food.
Have you considered allotment growing?
You can enlist the whole tribe and they can take their blackberries outdoors. :)

I've tried tomatoes, but failed.
Organic food it the UK is pricey (ok, maybe worth it's price and rather all the supermarket grown GM stuff is ridiculously cheap) and it's all nice when you're a single or a couple with a cat. It's getting very expensive once you cook for the whole family. Not even mentioning that kids always waste a lion share of what you cook anyway.
As a contrast, my parents back home shop daily - from a local market, butcher and a baker. They buy what they need only. The only time my IBS fades away is when I visit them :-/