Expression: "a tea" or "tea"

[Tom]

Hello everybody

Could we say at the hotel?

1- I want a tea
2- We ordered two teas.
3- I am having a tea.

Could we also say this at home? Will it be standard English?

Tom

[Mister Micawber]

Yes-- a tea, a coffee, a beer: all are commonly used countably, at home and abroad. It may be a short form for a cup of..., a glass of....
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Native English teacher at Mister Micawber's