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I am trying to make the following sentence:

"I need to eat something" , but I don't know which particle I should use, I've
come up with these 2 sentences, which one is right?

1 何かを食べるのが必要

2 何かを食べるを必要

Should I use が or を?

Also I don't get if 必要 is a verb or not so I'm not sure if I should use です at
the end of both.

Edit: in the second sentence I have two を particles, is it allowed or the
sentence should be:

何かに食べるを必要
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particle-が
Which particle should I use?
If you want to use 必要 then:

> 何か食べるものが必要だ。

I'm not a native speaker but I think this has more of a meaning that 'eating
something is a requirement'. Perhaps

> 何か食べるものがほしい。

would be better.

必要 is not a verb. It is a na-adjective. When it modifies a noun you add な to
the end of it. When it is used as a predicate it takes だ or です.

I replaced の with もの because it is a 'tangible thing' that you are needing.
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# Which sentence is right?

>   1. 何かを食べるのが必要
>

This is right(but somewhat unnatural).

>   2. 何かを食べるを必要
>

This is wrong(Even so most native speakers would understand what you mean).

This is because 必要 is not a verb.

The sentence @user3856370 wrote:

> 何か食べるものがほしい。

is better.

It seems like you are assuming that the pattern `OBJECT を VERB` will translate
to `SUBJECT VERB OBJECT` in English and similarly that `SUBJECT が VERB`
equates to `SUBJECT is(are,be) ADJECTIVE` or `SUBJECT is(are,be) NOUN`, right?

I am not really understanding what you mean by "verb" in your question.

# Should You use `です`?

`です` is optional in terms of grammar, but I feel that adding `です` is better.

`です` impresses listeners politeness or objectivity.

Moreover, in this sentence, you might be trying to ask for a favor or persuade
someone to do something. Especially in these cases, adding `です` is better
since it is more polite.

Thus, I would suggest:

> 何か食べるものがほしいです

# IS having two を-particles allowed?

For example, the sentence

> 何か を 食べること を やめた

is grammatical.

Using the `NOUN(SUBJECT) を VERB` → `OBJECT VERB NOUN(SUBJECT)` rule,

> 何かを食べるを必要

There are two candidates for parsing this:

  1. ((何か を 食べる) を 必要)
  2. (何か を (食べる を 必要))

## candidate 2

`食べる を 必要` is `VERB を ADJECTIVE`.  
This way of parsing it is not grammatical, thus candidate 2 is invalid.

## candidate 1

`何か を 食べる` is `SUBJECT を VERB`.  
This is grammatical and a complete sentence.

Next,  
((何か を 食べる) を 必要) is `SENTENCE を ADJECTIVE`.  
This is not grammatical, thus candidate 1 is invalid.

And thus,

> 何かに食べるを必要 is wrong.
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> "I **need to** eat something."

To say this, I think you'd normally use なければならない, なければいけない, なくてはならない etc. as
in:

> 何か食べ **なければならない** 。  
>  何か食べ **なければいけない** 。  
>  何か食べ **なくてはならない** 。  
>  何か食べ **なくてはいけない** 。  
>  何か食べ **ないといけない** 。  
>  (I/You/Someone) need to / have to / must eat something.

* * *

You can use the word 必要 like this:

> Verb + 必要がある。/ 必要があります。

Here, 必要 is a noun, and the preceding verb modifies it as a relative clause. が
is the subject marker, and ある/あります means "exists" or "there is..."  
So your sentence can translate to:

> 何か食べる **必要がある / あります** 。  
>  Lit. There is a need to eat something.

* * *

To use the na-adjective 必要(な), you use the particle が, as in:

> Noun + **が** 必要だ。/ **が** 必要です。

So you could say like this, using a nominalizer こと:

> 何かを食べること **が必要だ / です** 。*  
>  Lit. Eating something is necessary.

* * *

You could also use the verb phrase 必要とする like this:

> Noun + **を** 必要としている。/ **を** 必要としています。

Now you use the を particle. Using this form, you can say like this:

> 何かを食べること **を必要としている / としています** 。*  
>  Lit. (I/You/Someone) is in need of eating something.

*These sentences sound less colloquial than ～なければならない, ～なくてはいけない etc.
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