Take your own food AND water, to last you the entire 24 hour journey. Do NOT depend on the so-called "catering" service in this train.
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Catering is technically "available", but the food is positively HORRIBLE, and catering service is sparse. Thick, unhealthy, oily, INEDIBLE pooris are provided. Tea is undrinkable, luke-warm AND expensive (Rs. 10).
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Overall...
more... service inside the train is also horrible. He will come take orders for Breakfast, lunch and dinner. If you miss him, that's it!!! He will NOT come again. No one ELSE will ever come again, asking if you need water.
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Especially, please take AMPLE supply of water with you, for the whole journey.
I came by AC 1st class from CSTM to SBC, but my experience was overall THIRD CLASS.
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Needless to say, avoid this train if you have other alternatives.