Why are you worried about what others eat, whether it is Non-VEg or Veg. If you look exclusively of Veg food, its ingredients are non-Veg if you look at the basics. For eg : for an vegetable, to grow, it needs its manure and nutrients which is derived from manure which is made of composte from decaying bodies from the earth, Similarly in the water there are lots of microorganisms and bacteria, why only food and water, even the air you breathe is Non-VEg.
