No pantry might cause problems as the stops are also averagely after 3 hours...
So to overcome the food issues U may try the following
1.Before boarding at Haridwar make sure U pack your food from any of the restaurants.Plenty of options outside the station.
2.People who wake up early mite get their breakfast at Jhansi or else Bhopal at 10.30 is quite a...
more...

good option.Bhopal has many food stalls.
3.Make sure that you buy your lunch from Bhopal as the next halt is directly at Bhusawal.If you can,please buy some light snacks for your lunch..Make sure you do not buy the food from the vendors enroute as the food is nothing but a total waste of money.
4.At Bhusawal you will easily get enough for your evening snacks and even get your dinner from here..Food plaza server excellent Pav-Bhaji,Vada,Dosa,egg biryani,chicken pulav,etc..
5.Make sure you get your food from bhusawal itself cos halt at Nasik is for just 2 minutes and at Igatpuri,u won't get much option as at Bhusawal..You mite sign off with Chikki(A Chikki is a traditional ready-to-eat Indian sweet generally made from groundnuts and jaggery.)..
Above information from my own experience.