[Vocabulary] Domestic, nothing imported

[drangiana]

My question is related to one of the dialogues in the movie Deadpool (2016), so please everyone who has watched the movie, read the rest.
When wade wilson (deadpool) is in the bar, he says:
Soldiers of fortune, drinks on me!
Then his friend Weasel (the bar attendant) says:
Domestic, nothing imported.
What does the bold sentence mean??

 

[Rover_KE]

I don't need to have seen the movie to answer this.

He will only pay for the cheaper variety.

Domestic drinks (those produced in that country) are cheaper than imported ones (those shipped in from abroad).