Well, there are some extra things that you can use to help keep your mana up.
1.
Mark of Conquest A lot of you probably have a better trinket in terms of DPS, but depending on the speed of your bow, that can average out to around 20 mp/5, and it still gives a nice boost to your AP.
2.
Superior Mana Oil. Really cheap for enchanters to make, and each oil has 5 chargers that last for an hour and lasts through death. That's another 12mp/5, and you don't have to sacrifice putting something better on your melee weapon, because what else do we ever use? Sharpening Stones? Oh, and if you happen to Dual Wield, you can put it on both melee weapons, but not your ranged.
3.
Blackened Sporefish. I'd really only suggest this if you find yourself running low on Mana fast. It's 8 mp/5 and +20 spirit, but if you're desperate enough to replace Ravager Dogs or Warp Burgers with this, you should probably re-evaluate your gear and shot rotation. Anyway, I fish up the zangarian sporefish in Zangarmarsh with a base skill of 250+. The lake around the Cenarion Outpost requires 305 total fishing. Also a great place to catch food if your pet eats fish.
Come to think of it, with the Mana oil and Mark of Conquest, I was able to get through a Nightbane fight with only 1 Mana pot. I can't remember if I was using AotV... I might have switched back and forth.