Has the water you drink been drunk before?? If so, how many times? If not, where do you think fresh water comes from??

When you discover there is a lot of fish sperm in the water you are drinking then you know it has been consumed before.

By not only fish but any species of animal too.

Water is continually being recycled, therefore you are drinking what the dinosaurs drank and also what they peed.

It's all been passed through many organisms, many times by now.  With the exceptions of very small amounts that are created through  certain types of combustion and other chemical processes.  Even then the hydrogen and oxygen has likely been passed through, or been a part of, an organism.

Water gains and loses impurities along the way. Molecule by molecule, most of those impurities stay behind in the evaporation part of the water cycle. Then water falls and gains impurities anew. Some of those impurities remain in the soil as water seeps down, in the case of ground water, or accumulate as water flows over the earth. The impurities, and the potential for ill health effects, is the reason water treatment has been the norm for over a century.

i would hope not

The water you drink today was pee pee  at some point.  The amount of water on Earth doesn't change. 

Thanks for that.  :)