Jain food !!!
I don’t know what you heard about SRM mess but I assume that whatever you know is far from reality. In SRM hardly any separation of veg and non-veg food. Plates are limited so it might be case that you will get your food in the same plate that was last used for serving non-veg. So if you don’t eat onions etc in your food then there is no choice left but to adapt and start eating it. Also mentally prepare yourself for the tasteless food you are going to get here!!
But, there are a lot of places in and around campus that might give you some options, if you personally ask them to not include the vegetables or food you don’t eat.