Can you get me a beer IN French?

You could say:

* "Une bière, s'il vous plaît." (Formal, literally "A beer, please")

* "Une bière, merci." (Formal, literally "A beer, thank you")

* "Je voudrais une bière." (Formal, literally "I would like a beer")

* "Une bière, s'il te plaît." (Informal, literally "A beer, please")

* "Une bière, merci." (Informal, literally "A beer, thank you")

* "J'aimerais une bière." (Informal, literally "I would like a beer")

The best option depends on the context and your relationship with the person you're talking to.