Although Udyan Exp departs Bangalore at 2000 hrs, catering services do come around asking for dinner. The choice is very limited - veg, egg or chicken biryani in a single aluminum casserole w/plastic spoon inside. Curds are also sold separately. The exact same choice is available for lunch the next day. For breakfast idli / bread omlet was available.
It makes much more sense to pack something from outside for dinner on Day 1.