Can't seem to find an empty flask needed in the serpent temple.

Same here. I looked all over the temple but no empty flask. However I did find one called ?Flask? but I think it is a mana potion cause of its blue color. Can you buy one in town maybe? Now I have 5 of my party is poisoned ughhh.

They are in the kitchen.. on each oven-looking thing there are empty flasks.

Thanks Caseman for the tip.
Here's one in return. If you identify a potion and leave it with a character, then everytime you move an un-identified potion of the same type onto that character, it will be identified. By the way a yellow potion cures poison.