Brew and blew are words that are easily confused when trying to pronounce them.
Brew most commonly means to make beer by steeping, boiling and fermenting malt and hops. However, we also brew tea, and that refers to the time we allow the actual tea to steep in hot or boiling water. When coffee is made in a way that water slowly seeps through ground coffee under gravity, it is considered brewed coffee. I have heard that witches also brew all kinds of concoctions. As a noun, brew can be the mix the witch makes, or simply a serving of beer or ale.
As for blew, it is the past tense of to blow. As an example, the musician Louis Armstrong died earlier than he might have not only because he blew his trumpet so well (which caused lip problems), but also because as a smoker, he blew too many smoke rings. But lots of other things might have blown. Look at these examples:
*The wind blew so hard it howled.
*When a diner blew his nose loudly, other diners left the restaurant.
*The glass blower blew a magnificent sculpture.
*A siren blew to warn of a tornado.