I assume you want the phrase in spoken Arabic rather than in standard written Arabic. I also assume you want it written in Latin script, not in Arabic script. Please correct me if I am wrong.

Pronunciation: The OW in LOW sounds like the OW in "powder".

If you are addressing a female bartender, the last word in the phrase will be SAMAHTI.

The word WAHDA (“one”) is not necessary.

Please don't be surprised if you hear WAHID BEERA in place of BEERA WAHDA. I hope you are familiar enough with the nebulous nature of spoken Arabic and with the regional differences among Arabic dialects. Slight phrasing or pronunciation modifications may be necessary in some areas.

If you want to see a previous discussion on “beer”, look at the following page:

http://www.proz.com/v3/index.php3?sp=h&sid=&id=30274&keyword...

Fuad