If I thought about it practically it would probably be soap and toilet paper... honestly... I dont want to think of a life without soap and toilet paper! I'm not fussy, it could be 1 ply sand-paper style toilet paper... but as long as it was clean!!!! AND soap... soap is a must.... if I HAD to I would wash my hair with soap... not that I would want to... but if we're talking bare necessities, I could handle it.
ALSO... probably.... although less important... I'd need my mobile phone. When I've been out of the house or away from my phone charger and my phone has run out of batteries, or I've left it behind, I go into full panick mode!!! WHAT IF I NEED IT?!?!?!?!?!