i) Normal sleeper class category travel with Rs. 580/-
ii) Food cost is included in the fare and hence no extra payment for this in the train. You will get... .. Lunch, Evening tea, Dinner and Morning tea (mostly) ...
iia) Beyond the food items which are included in the fare charges, extras .... one will definitely get but for that extra payment need to be made.
iii)...
more... If bed roll is desired, you can book it at the time of ticket booking ... but for this.. extra payment of Rs. 25/- .
Good wishes.