A flask in a dream symbolizes preparation, survival. It is often interpreted as a sign of forewarning and the need to be prepared.
For example, if you are walking around with a flask in your hand and you notice there is no water around, it can signify that you are trying to survive on your own but there may be some potential risks ahead. You’re anxious or worried about your future and want some reassurance.
When you dream about drinking from the flask, it can stand for the need of being prepared for an upcoming event or situation that may require some additional time and resources.