Daar is 'n behoefte aan water.

Here Daar is is the Afrikaans way to say there is / there are when you are stating that something exists.

So in this sentence, Daar does not mainly mean a physical place like over there. It is part of an existential construction:

• Daar is 'n probleem. = There is a problem.
• Daar is hoop. = There is hope.
• Daar is 'n behoefte aan water. = There is a need for water.

Afrikaans uses daar in the same kind of way English uses there in there is.

Compare:

• English: There is a need for water.
• Afrikaans: Daar is 'n behoefte aan water.

So although daar can also mean there in the location sense, in this sentence it is really serving as a grammatical starter for an existence statement.

'n is the indefinite article, the equivalent of English a / an.

So:

• 'n behoefte = a need

Pronunciation:

• It is usually pronounced very weakly, like uh or a quick ə sound.
• In normal speech, it is often unstressed.

A useful learner tip: do not pronounce it like the English letter name en.

Also, 'n is always written in lowercase, even if it appears at the beginning of a sentence.

With 'n behoefte, the noun is being treated as a need.

So the sentence literally has the structure:

• There is
  • a need
    • for water

Afrikaans can sometimes also omit the article with abstract nouns, especially in more formal or general statements:

• Daar is behoefte aan water.

That version is also possible and sounds a bit more abstract or formal, like there is need for water.
But Daar is 'n behoefte aan water is perfectly normal and very understandable.

Because behoefte normally goes with aan in Afrikaans.

This is a fixed pattern:

• behoefte aan iets = need for something
• Ek het behoefte aan rus. = I need rest / I have a need for rest.
• Daar is 'n behoefte aan water. = There is a need for water.

This is something you mainly need to memorize as a collocation:

• behoefte aan
• not usually behoefte vir in standard Afrikaans

Because water here is being used as a mass noun in a general sense, just like in English.

Compare:

• water = water in general
• die water = the water, specific water

So:

• aan water = for water / for water in general
• aan die water would mean for the water, referring to some specific water already known in the conversation

In a normal Afrikaans main clause, the finite verb must usually come in the second position.

So:

• Daar = first element
• is = second element

That gives:

• Daar is 'n behoefte aan water.

The version Daar 'n behoefte aan water is is not correct as a standalone main sentence.

However, that word order can appear in a subordinate clause:

• Ek dink dat daar 'n behoefte aan water is.
  = I think that there is a need for water.

So this is a good example of the usual Afrikaans contrast between:

• main clause: verb second
• subordinate clause: verb later in the clause

Yes, you often can.

Both are possible:

• Daar is 'n behoefte aan water.
• Daar is behoefte aan water.

The difference is mostly one of style and nuance:

• 'n behoefte sounds like a need
• behoefte without the article can sound a little more general, abstract, or formal

In everyday language, both may be heard, but the exact preference can depend on context and speaker style.

A straightforward negative version is:

• Daar is nie 'n behoefte aan water nie.

Afrikaans usually uses double nie in this kind of sentence:

• first nie after the verb
• second nie at the end

You may also hear:

• Daar is geen behoefte aan water nie.

That means There is no need for water and can sound a bit more natural than using nie 'n ... nie with an indefinite noun phrase.

You invert the verb and daar:

• Is daar 'n behoefte aan water?

That is the normal yes/no question pattern in Afrikaans.

Compare:

• Statement: Daar is 'n behoefte aan water.
• Question: Is daar 'n behoefte aan water?

Yes. It is grammatical and natural, though it sounds somewhat neutral to formal.

Depending on context, speakers might also choose more direct everyday alternatives, for example:

• Water is nodig. = Water is needed.
• Daar is water nodig. = Water is needed.
• Mense het water nodig. = People need water.

Your sentence is especially useful when you want a more formal or report-like tone:

• Daar is 'n behoefte aan water. = There is a need for water.