Vull aigua.

Vull means I want and is the 1st person singular present tense of the verb voler (to want).

A few present-tense forms for reference:

• jo vull = I want
• tu vols = you want
• ell/ella vol = he/she wants
• nosaltres volem = we want
• vosaltres voleu = you all want
• ells/elles volen = they want

So Vull aigua is built very simply: verb + noun.

Catalan often drops subject pronouns when they are not needed, because the verb form already tells you who the subject is.

So:

• Vull aigua = I want water
• Jo vull aigua = I want water

Both are correct, but jo is usually added only for emphasis, contrast, or clarity.

For example:

• Jo vull aigua, no vi. = I want water, not wine.

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

So:

• Vull aigua = I want water

If you add an article, the meaning becomes more specific:

• Vull l’aigua = I want the water
• Vull una aigua = I want a water (often understood as a bottle, glass, or serving of water, especially in a restaurant)

So in the basic, general sense, no article is normal.

Aigua is feminine.

You can see this in phrases like:

• aigua freda = cold water
  not aigua fred

When it takes an article, it becomes:

• l’aigua = the water

Catalan does not say la aigua. Before a vowel sound, la becomes l’.

So even though the noun starts with ai-, it is still feminine:

• l’aigua freda
• aquesta aigua = this water

A common Central Catalan pronunciation is approximately:

• vull ≈ booly with a short ending sound, often written roughly bool
• aigua ≈ EYE-gwuh

A more linguistic approximation would be:

• vull: /buʎ/
• aigua: /ˈajɣwə/

A few helpful notes:

• v is often pronounced like b in Catalan
• ll in vull is a palatal sound; in some accents it may sound closer to y
• ai in aigua sounds like eye
• gua sounds like gwa

If you are a beginner, BOOL EYE-gwa is a reasonable rough guide.

No. This is the normal Catalan order:

• Vull = verb
• aigua = direct object

So Vull aigua follows a very ordinary pattern: (subject omitted) + verb + object.

You could also say:

• Jo vull aigua

But the basic order stays the same.

It is grammatical and natural, but in some situations it can sound blunt or very direct, especially when ordering something.

Catalan often uses softer forms for politeness, such as:

• Voldria aigua. = I would like water.
• Em posa aigua, si us plau? = Could you get me water, please?
• Aigua, si us plau. = Water, please.

So Vull aigua is fine for expressing desire, but in a café or restaurant, many speakers would choose something more polite.

• Vull aigua = more direct, I want water
• Voldria aigua = softer, more polite, I would like water

Voldria comes from the conditional of voler and is very common for requests.

So:

• if you are simply stating what you want, Vull aigua is fine
• if you are asking politely, Voldria aigua is often better

Yes, in certain contexts.

Normally, aigua is uncountable:

• Vull aigua

But in everyday speech, especially in bars or restaurants, Catalan can use una aigua to mean something like:

• a bottle of water
• a glass of water
• a serving of water

So:

• Vull una aigua can be natural in the right context

But if you are learning the basic sentence pattern, Vull aigua is the most neutral form.

Yes, but it means something different.

• Vull aigua = I want water
• Necessito aigua = I need water

Necessito sounds stronger and suggests necessity rather than preference.

So if you just mean desire or request, vull is the right verb. If you mean real need, use necessito.