Q → A → what they'll probably say
Q ¿Qué vas a tomar?/¿Qué quieres beber? — What are you having?
They'll say Vale. ¿Algo de comer? / ¿Y para picar? — Okay. Something to eat? / Anything to snack on?
Q ¿De barril o de botella? — Draft or bottle?
They'll say ¿Cuál? Tenemos Mahou/Estrella… — Which one? We have Mahou/Estrella…
Q ¿Rubia o tostada? — Blonde (lager) or amber?
They'll say Vale. Ahora te la pongo. — Alright. I'll get it now.
Q ¿Algo más? — Anything else?
They'll say Perfecto. — Perfect.
Q ¿Para aquí o para llevar? — For here or to go?
They'll say Son __ euros. — That'll be __ euros.
Q ¿Te pongo otra? — Want another one?
They'll say Vale. — Okay.
Q ¿Cómo quieres pagar? — How do you want to pay?
They'll say Acércala aquí. — Tap it here.
Q ¿La cuenta? / ¿Queréis la cuenta? — The check? / Do you want the check?
They'll say Ahora mismo. — Right away.
¿Una caña porfa? — A beer, please? (the small draft — how locals order)
Cuando puedas. — When you can (no rush).
Gracias, jefe/jefa. — Thanks, boss. (very casual — use with care)
Q ¿Qué te pongo? — What can I get you?
They'll say ¿Para tomar aquí? — For here?
"Solo" = straight espresso; "cortado" = with a little milk; "con leche" = latte-ish.
Q ¿Frío o caliente? — Cold or hot?
They'll say Marchando. — Coming right up.
"Café con hielo" = they give you a hot espresso and a glass of ice to pour it over.
Q ¿Tenéis algo para desayunar? — Do you have anything for breakfast?
They'll say Tostada con tomate o con mantequilla. — Toast with tomato or with butter.
"Tostada con tomate" is the classic Spanish breakfast.