What brings the sweetness, bitterness or poisonous nature in things?

As my wife and I were sitting in the backyard past weekend, busy prepping and painting the house, I decided to take a break and picked some grapes from one of the grape vines in the yard. Man! they were just sweet! I start thinking spirituality asked my wife as to what make a them so sweet? She is like, I don't know. I mean, dirt and water are same everywhere. And, if I were to mix these two ingredients in a separate bowl, I don’t get sweet or bitter or poisonous results then how come these two ingredients make things the way they are. Do I just accept that it is just the nature of things and this is how God made them or Do I look for a scientific explanation as to how chemicals and nutrients mix and change in to these properties? I did take some chemistry in college and may be it will be helpful. And, then on Tuesday morning, I hear about the Alligator Guy, Steve Irwin in Australia dying from sting ray bite. I have learned a little about sea creatures and played in tide pools a little bit with snorkeling once, but I never knew these sting rays could be that deadly. Not only the jagged sharpness but the toxins on top of that. Those barbs have known to pierce thru a wooden plank in a boat. That is some power of a Sting ray! I mean what are the chances of a famous guy getting killed by a sting ray attack given the mathematical odds and history of these attacks. I guess it must be the nature of things and God must have made them the way they are.