I was told that is ok to use

> 何でもないが欲しいです。

in an informal setting for "I don't want anything."

Is this correct? And what is an expression I can use in a formal situation?
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2017-05-11T11:05:52.147
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word-choice expressions set-phrases culture
A formal/informal way to say I don't want anything
何でもないが欲しいです would mean 'It's nothing, but I want it.' Honestly it makes very
little sense. You seem to have taken 何でもない as a noun, but really it's a full
phrase meaning 'It's nothing.' To say you don't want anything, I think 何も欲しくない
would work (though I'm probably wrong). It would be a little more natural to
say 何も要らない 'I don't need anything', though, I think. Formally you could say
何も要らないです or 何も要りません.
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In formal way: 申{もう}し訳{わけ}ありませんが何{なに}も欲{ほ}しくありません。 /
申{もう}し訳{わけ}ありませんが何{なに}も要{い}りません。

In informal way: 何{なに}も欲{ほ}しくない（よ）。 / 何{なに}も欲{ほ}しくないんだ。 / 何{なに}も要{い}らない（よ）。

**Postscript**  
何も要らない is better than 何も欲しくない, which is written in **Nothing at all** 's
answer.
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If the scenario were saying "I don't want anything" in response to someone
offering you something (food, drink, etc.), you could also use

> （私は）[結構]{けっ・こう}です。 → I'm fine/all right.
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