How can I save a Word document to my iPad?

Hello,

I have an iPad2 running the latest version of iOS. I can view Word documents that arrive in my email but I would like to save them to my iPad in a more permanent and easily accessible manner. Obviously the iPad doesn't have a visible file system and saves documents to the appropriate app instead. Alas I cannot seem to find a way to save a Word document to my iPad. I definitely do not want to edit the document so I do not need Pages. I'm left wondering how other users store Word documents on their iPad and if there is a built-in app that allows general storage of files in recognised formats. Just to be clear I would like to confirm that the Word documents are not arriving in .odt format and thus they can be viewed in email

Many thanks for your help with this conundrum,

Andrew