How can I buy a drink here?

Hint 1 of 6:

First of all, I should tell you that it doesn't matter which drink you buy.

Hint 2 of 6:

You will need money if you expect to get anything here.

Hint 3 of 6:

Or at least something similar to money.

Hint 4 of 6:

Like a credit chip?

Hint 5 of 6:

Did you go near the teleporter on the north end of the island?

Hint 6 of 6:

The guard there had a credit chip next to her.  Take it.