Here are some useful phrase and vocab for when you go to a restaurant.

La reservación - The reservation

Quiero reservar una mesa para tres personas - I would like to order a table for three people
A qué nombre?- In what name?
He reservado un mesa nombre de Paul - I have reserved a table in the name of Paul
Tiene usted una mesa para cuatro personas - Do you have a table for four people?

A la mesa - At the table

Quiero/quisiera/me gustaría- I would like
Quiero ver el menú por favor- I would like to see the menu please
Qué nos recomienda?- What would you recommend?
El menu del día es - The set menu of the day is
Han decidido?- Have you decided?
I`d like to order now- Quiero pedir ahora
Con qué est´ servido/acompañado?- What does it come with?
Qué sabores hay?- What flavours are there?
Lamento, no tenemos- I`m sorry but we don`t have
Buen provecho- Enjoy your meal
Salud!- Cheers!

Baños - Toilets

Dónde estan los baños? - Where is the toilet?
Los baños est´n al fondo a la izquierda- The toilets are at the back on the left

Pago - Payment

La cuenta, por favor - Can we have the bill please?  
Aceptan tarjetas de crédito? - Do you accept credit cards?
Dejamos propina? - Should we leave a tip?

Quejas-Complaints

Necesitamos otro tenedor/cuchara/cuchillo- We need another fork/knife/spoon
Pedí hace treinta minutos- I ordered 30 minutes ago
No es lo que pedí - That`s not what I ordered
Queremos azúcar/sal/pimienta- We would like sugar/salt/pepper
La carne esta demasiado hecha- The meat is overdone
Este vaso es sucio- This glass is dirty
Pienso que hay un error en la cuenta- I think there is an error in the bill

Adjetivos para describir la comida - Adjectives to describe the food

Est` - It is
caliente - hot
frío - cold
sabroso - delicious
picante - spicy

3 verbos utiles en cuanto a la comida - 3 useful verbs when referring to food

Tomar-To take

Ex. Voy a tomar una copita-I`m going for a drink
Comer-To eat

Ex. Come tortilla-He/she is eating tortilla
Beber-To drink

Ex. Bebemos vino-We drink wine

Los platos del día - Meal-times

desayuno-breakfast
almuerzo-lunch
cena-comida

Useful food vocab

Vino (tinto/blanco) - Wine (red/wine)
Una jarra de agua - A jug of water
Empanada - Folded and stuffed corn tortilla
Tortilla- Spanish omelette cake filled with potatoes
J`mon Serrano - Serrano jam
Gazpacho - Tomato and pepper soup

Primer plato- Starter
Plato principal - Main course
Postre- Desert
Bebida- Drink