What would someone expect to eat for a 20zl budget? modest sandwiches, well cooked meals, etc etc?
Well it's difficult because you have to multiply that by say 7 and then go to the supermarket and spend the money but for that you can have noodles, sausages, rice, chicken, crisps, vegetables, ect ect the list goes on.
I think even 20zl is alot the more I think about it.
In answer to your question I think cold breakfast a small hot lunch and then a cooked dinner is possible for this budget.
All this is dependant on yourself of course!