I wouldn't worry about carrying all those elixars and pots. All you really need for tk and ssc is mp5 flasks, whatever food you choose(sometimes stam is the best choice, fights like al'ar), and mana oil.
As you gain gear upgrades in tk/ssc your mp5 will initinally drop, while your stam and healing will go up most likely. Esspecially getting rid of that nasty PMC =P. This means you'll probably wanna get the mp5 back with the flask.
Most fights in BT/Hyjal will be best with the mp5 flask also, except for RoS which mp5 really doesn't mean anything since each phase is so quick. Not to mention a few fights I put on some PvP gear, since raid damage is so high which causes me to lose mp5.