Collocations for flask - noun

metal, silver
water
hip (BrE)
conical, culture, glass, round-bottom (all science)
Thermos™, vacuum (both BrE)

fill
carry
When he climbed in the snow he always carried a silver flask of brandy for emergencies.

pull out
She pulled out her flask and drank from it.

open, unscrew
drink (sth) from, take a swallow from, take a swig from

contain sth
a culture flask containing 4 ml of the medium

flask of
He had a flask of Scotch in his pocket.