LOL! Even parents who would love to give their kids this kind of life (such as myself) would be hard pressed to achieve this level of purity... like someone said, we live in "reality" or what passes for it anyway... but more power to you, if you do get to!
I take my prenatal but I eat a lot of greens. To help my immune system I add all kinda of spices to my foods, my main are garlic, ginger and basil. These are known to be antioxidant, antiviral and antimicrobial.