. . . . . . . . man always went to . . . . . . . . same bar at . . . . . . . . same time everyday and asked for two glasses of . . . . . . . . soda.

In the first blank, article "a" will be used as a "man" is a general term.
In the second blank, article "the" will be used because it is the same bar, they are referring to something specific.
Similarly, In the third blank, article "the" will be used because (same time) something specific has been mentioned.
In the fourth blank, no article will be used as it is Definite that there are two glasses of soda. And no article is used before noun + number.