I did the 139 out to Mumbai in WT two weeks ago. I took the non-veg which was chicken with some very sweet risotto. It was ok. A second meal was offered later, it was identical to the first but the flight attendant said it was an error but it is supposed to be another hot meal not a KitKat.

You absolutely must remember to bring your own bottles of water on board. There are drinks runs of cups of water but it is much more pleasant if you take your own.

Edit: water comment for between meals. There is a bar service after take off and they are probably generous (two miniatures of gin plus wine for the meal).