bottle biology

In my bottle, I will test the effect that rainwater has on a battery and magnesium in both the soil and water. I will record the clarity of the water everyday. I will also look at the pH of the water before the experiment and see how it changes by the end of the experiment. If I can find a way to do it, then I would also like to record the pH everyday. I would like to do this as it pertains to my recycling project. I can see the affects in a small, controlled environment.