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For those who are having problems/ want to know how to prepare for mana problems I have farmed some items which I am sure you may find helpful as well
Each of these items uses NO GCD and takes your healthstone cooldown meaning they can in some cases get you just enough mana to get by to make to your next judgement/divine plea/arcane torrent cooldown to refil your mana and still let you chug a dps pot.
Night Dragon's Breath(farmed in Felwood restores about 500 mana no gcd with a 2 min icd)
Demonic/Dark rune( farmed in felwood/scholo 15 min cd take ur HS cd of 2 mins and no GCD penalty)
Runes were nerfed but it still is the most mana back around 1000 or so so use these first easy to farm too can get while you farm night Draon'g breath
The item Lea of Lillies can spawn one lilly root which refils about 500 mana just like Night Dragon's breath above but it's only 1 per hour but free
My favorite and one I am saving for a riany day has 3 charges from a quest in EPL
Tea with Sugar (restores over 1,000 mana and health 2 min cool down does not interfere with GCD)
I farmed all of these items in case I run out of mana in future progression not currently having any issue
Was able to test them out in Naxx 10 man cause our pally tank was judging light instead of wisdom like he was assigned and it kept me from going oom just long enough for my Divine Plea and Arcane torrent cool downs Fight last a little under 3 mins so only got to use one of these 1 time but in longer fights were we are not taking an excessive amount of dmg to proc extra SA heals will prolly come in handy.
Just for fun I farmed a stack of Strat holy water to use in the rare times I have no moves ready to use in my FCFS rotation small dmg boost but fun and who knows maybe someday it will come in handy
I may be thinking too far into this but I had read that the mechanical Yeti in Winterspring quest scales with your level all the way to 80 so I farmed him too figured it cant hurt
I know the Yeti and strat holy water may be crazy but the mana regen ones are actually very useful and worth farming. I often finish a full night of raids with the orginal healtstone I picked up at the first pull and these items allow that cooldown to put to DPS increasing usage. Of course it is not worth it to use these items in fights where you may be in danger of dying without a hs so use judgement