2 Specific things i use in threat sets that i wouldnt use for normal boss tanking and such:
http://www.wowhead.com/?item=30642
http://www.wowhead.com/?item=34470 - Or other threat trinkets, i just use this because i dont have any others
Otherwise, just make sure your dps is doing the job right, and dont bother maxing threat - if dps is good, you should only need to judge the mob once or twice with consecration to have enough threat to hold it until it dies. After the first mob dies, just put up seal of wis and swing at the remaining mobs, with a downranked consecrate. This should hopefully stop you using too much mana, if you still arent taking enough damage, try sitting or turning around.
Another nice trick if you have a healer with a lot of regen is to have a macro/use a mod to unequip and reequip your gear when you are out of combat, so your health will drop to around 5-6k or whatever, and you will require around 10k healing from your healer, and restore that mana.
With these sort of things in place, and BoW on, you shouldnt need to be drinking extensively. Just try to stack spelldamage and get a feel for what your dpsers are capable of, and dont try to do max threat, just enough not to threat cap them
