I didn't get any empty flasks in the storage area. Can I get one elsewhere or did I not look hard enough.
P.S. I wish I could play and post at the same time!

Was there on my replay 2 days ago. There are at least 4 flasks. When you say storage area, I am not sure exactly what you are referring to. There is a room commonly referred to as the kitchen, which has a lift on one end to a storage area. There are two flasks sitting out on the bench opposite and a little left of the doorway as you enter. At the opposite end of the room is a lever or lock to a secret area. There are 2 more empty flasks in the chest there. Good luck

I was refering to the area with the six locked rooms where you need the different lever combos' but I'll check the area you mentioned. Thanks