Asking for Extras

Requesting more water, bread, napkins, utensils, or salsa during your meal.

You
Disculpe, ¿nos puede traer más agua, por favor?
dees-KOOL-peh, nohs PWEH-deh trah-EHR mahs AH-gwah, pohr fah-BOHR?
Excuse me, can you bring us more water, please?
'¿Nos puede traer...?' (Can you bring us...?) is the most polite and common way to ask for something at a restaurant.
Waitress
Por supuesto. ¿Necesitan algo más?
pohr soo-PWEHS-toh. neh-seh-SEE-tahn AHL-goh mahs?
Of course. Do you need anything else?
You
Sí, ¿nos trae unas servilletas y un tenedor limpio?
see, nohs TRAH-eh OO-nahs sehr-bee-YEH-tahs ee oon teh-neh-DOHR LEEM-pyoh?
Yes, can you bring us some napkins and a clean fork?
Useful utensil words: 'cuchillo' (knife), 'cuchara' (spoon), 'tenedor' (fork), 'servilleta' (napkin).
You
¡Ah! Y más salsa picante, si tiene.
ah! ee mahs SAHL-sah pee-KAHN-teh, see TYEH-neh.
Oh! And more hot sauce, if you have it.
'Si tiene' (if you have it) softens the request and sounds natural. In Mexico, there is almost always salsa available.