The giveWater browser extension cannot be downloaded to your browser without explicate user consent. It can either be downloaded from the browsers store (i.e. The Chrome Web Store, Firefox Add-Ons) or by clicking the "Make giveWater your homepage" button from the giveWater.com website. If you did not perform one of these actions and you do not share a computer (where someone else may have), please contact us and describe your situation so that we may assist you.
You may also simply uninstall the extension/add-on by viewing the instructions here.