When you download the giveWater browser extension it will change your homepage/new tab page to giveWater.com as well as change your default search engine to giveWater.com (powered by Bing).
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.