Ordering in a restaurant

( A ) coffee, please.
( A ) tea,please.
Chicken salad, please.
( A ) yogurt and water, please.
Fish and chips please.
Beef/pork/lamb and rice, please.
Spaghetti and soup, please.

What do you mean by these brackets are articles (a ) coffee, (a ) tea possible there?

Isn't a missing in chicken salad?

What do you mean by these brackets are articles (a ) coffee, (a ) tea possible there?-- The brackets mean that the article is optional: the nouns appear frequently both with and without 'a'.

Isn't a missing in chicken salad?-- No, not in my world. It is possible, but not nearly as likely as with ( a ) coffee.

HINT: when you wish to letter or number items in a lis

I mean chicken and salad as two separate meals
So I should say Chicken and salad please to be grammatically correct?
or chicken and a salad please?
Or maybe even one chicken and one salad please

Unless you are extremely hungry, you will not order one chicken. Also, chicken and salad (however expressed is a slightly odd order. That is why I changed your original in the first place.

You can use these as the most normal permutations:

The chicken and a salad, please.
Chicken and (a ) salad, please

Ok see What should be the correct order of the following sentences?
Hamburger and chips please or Chips and hamburger, please.
Pizza and salad, please or salad and pizza, please
Fish and rice, please or rice and fish, please
Hot dog and chips, please or chips and hot got dog, please
Beef and potatoes please is ok?
Lamb and past please is ok?

Put the entree or main dish or main ingredient first.