How can acid rain affect organisms that live in the water?

First, the acid rain may make the pH of water more acidic, and some organisms cannot survive in such environment and die.
Acid rain may also increase the amount of algae in water, and they will block the diffusion of oxygen into the water, thus the organism cannot respire, and they may die too.
This can lead to the decreasing amount of certain species and messing up the food chain.

The acid could hurt the organisms in the water by making the water acid water

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Only one reactant yields 2 or more products. meaning you will only have 1 product and it will break down into 2 or more products. eg. h2o -> h2 + o2