Hello, im currently in the first year of my IB program, taking Higher Level Chemistry, Im required to write an extended essay (4000 word paper). Im considering writing on water, performing analysis and comparing tap water, to some branded waters and reaching a conclusion. I read about a study in my local paper, where they talk about the high level of pollutants or germs some certain local bottled waters had. Any help as to what to research (topics), testing processes, and if this topic addreasable within the 4000 word limit. *Edit: My conclusion would be something along the lines of, is it worth it paying X times more for water in a bottle than tap; considering ´´pollution´´(Anything bad, pollutants, germs, traces of certain elements) levels in both local bottled and tap water.