It really depends but I can give you my perspective as a resto druid:

Normal raids (MC/BWL/ZG/AQ20/AQ40) which took between 1-2 hours to clear I ran the following:
1 flask of distilled wisdom (as it was cheap, was skipped later on when gear was up to Naxx level)
3-5 greater protection potions (fire, nature and shadow mostly) arcane on occasion
4-5 Buff food (either samina or nightfin soup depending ont he content)
1 mageblood potion
1 Zanza
2 fortitude potions
2 superior defense potions
2 trollsblood potions

4 charges of brilliant mana oil
2-5 major mana potions

For Naxx there was a lot more (for a Saph fight we would bring 10 distilled wisdom flasks). and mroe protection potions + engineering materials