Stop saying "I want". Here are 10 different ways to order food in English like a native speaker.

Different Ways to order food.

This is both formal and casual and can be used in most settings.

This is formal and used more in restaurants where a waiter is serving you.

More casual but still acceptable in most situations. You could also say "can I have a/an _____?"

This is very formal, and can sound a bit strange in casual settings.

You're not directly asking for the food/beverage, but whoever is serving you will clearly understand.

"Do" in this case is functioning as "take" from the first example

You don't have to say "think". "I'm going to go for" by itself is also fine.

I think I'm going to go for a/an _______.

EXTRA: Don't say this! This is rude. Fetch is an old way to say "go and get". However many people play a game called "fetch" with their dogs, so this word has acquired that connotation.

EXTRA: Fetch me a/an ______ now waiter. (Don't say this)