There are some really cheap ways to live.
But then, a whole chicken can do a good number of meals in of itself, more if you're willing to butcher it into various cuts, then you've got the bones you can boil to make stock/soup, ect.
As long as you don't pig out on huge portions, and just use it as an addtional you could get a weeks worth of meal add ons out of it. Add some spices and you wont get bored anytime soon.
Getting the ballence right can be tricky if you suddenly cut out all the "expensive" parts, but when you start using expensive addtions in proper portions the cost shrinks to a managable level.
I'm not veggie, but I use dehydrated soya to bulk out my meals cheaply. (1kg for £2, rehydrates to 4kg, bargin)