There will be base-game caravan shotguns, 10mm pistols, binoculars, and canteens. The one in the pre-order packs will be unque and have something speacial about tham such as higher damage, durability, accuracy, and fire rate.
I remember Gstaff posted this in another thread, but it's been confirmed that the Vault 13 canteen will be the only "standalone" canteen in the game.
There will, however be some combat type armors with canteens built into the suits...
LINK: http://www.gamesas.com/index.php?/topic/1114712-stuff-i-found-at-pax/page__st__80__p__16362373__hl__pre-order%20canteen__fromsearch__1entry16362373