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I'm looking to create a demo using the source development kit.
Because i want it to have a similar style to portal, but one I'm wondering can i get the portal 2 authoring tools without owning the game,
and two I'm finding it very difficult to find any form of tutorials for it, could anyone link me to some preferably PDF format or eBook i rather read them.

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You need to own at least 1 Source game before you are given access to the Source editing tools. I'm not quite sure what kind of demo you plan to make, or if that demo will require code changes or not, but I believe the Source SDK only provides you with Half-Life 2 mod tools, not Portal 2. You may be able to find more information on their website here: https://developer.valvesoftware.com/wiki/Main_Page

You can however make very sophisticated maps using Valve's map editor called Hammer. And again, you will need to own any game you want to design maps for (otherwise how did yo plan to test them?). There are plenty of Hammer tutorials out there, although here is Valve's official level design page for Portal 2: https://developer.valvesoftware.com/wiki/Category:Portal_2_Level_Design

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