أريد المزيد من الماء.

A careful MSA pronunciation is:

urīdu al-mazīda mina al-mā’i

A few notes:

• أريد = urīdu
• المزيد = al-mazīda
• من الماء is often pronounced smoothly as mina al-mā’i
• الماء has a glottal stop at the end because of the ء: mā’

If short case endings are not being pronounced in everyday careful speech, you may hear something closer to:

urīd al-mazīd min al-mā’

أريد is the 1st person singular present/imperfect form of the verb أراد, which means to want.

So أريد literally means:

• I want

It already includes the subject I, so Arabic does not need a separate أنا here.

Because the verb أريد already tells you the subject is I.

Arabic verbs usually show the subject clearly, so:

• أريد المزيد من الماء = I want more water
• أنا أريد المزيد من الماء also works, but it adds emphasis, like I do want more water or As for me, I want more water

So leaving out أنا is normal and natural.

المزيد means more or additional amount in this sentence.

Here it works like a noun phrase meaning something like:

• the additional amount
• more

So أريد المزيد من الماء is literally close to:

• I want the additional amount of water

But in natural English, we simply say:

• I want more water

In this expression, المزيد is commonly used with الـ to mean more / more of it / an additional amount.

So:

• المزيد من الماء = more water
• literally: the more/additional amount of water

This is a very common Arabic pattern:

• المزيد من الوقت = more time
• المزيد من المعلومات = more information
• المزيد من التفاصيل = more details

Because Arabic commonly uses من after المزيد to mean more of something.

So the pattern is:

• المزيد من + noun

Examples:

• المزيد من الماء = more water
• المزيد من الطعام = more food
• المزيد من الأسئلة = more questions

Without من, the phrase would sound unnatural here.

Here من means of rather than from.

So:

• المزيد من الماء = more of the water / more water

In Arabic, من has several meanings depending on context, including:

• from
• of
• than
• sometimes part of other fixed expressions

In this sentence, it is the normal word used after المزيد to introduce the thing you want more of.

In Arabic, mass nouns like water are often used with الـ in general statements or standard expressions.

So الماء here means:

• water in a general sense

This is very natural in MSA. Arabic often uses the definite article where English would not.

So:

• الماء = water not necessarily the water in a very specific sense

If fully vocalized, the sentence is:

أُريدُ المزيدَ منَ الماءِ

The case endings are:

• أريدُ — verb, ending in -u
• المزيدَ — accusative because it is the direct object of أريد
• الماءِ — genitive because it comes after من

So grammatically:

• أريدُ = I want
• المزيدَ = more/additional amount (object)
• منَ الماءِ = of water

In normal unvowelled Arabic writing, these case endings are usually not written.

When Arabic is read carefully with full vowels, من is often pronounced mina before a word beginning with الـ.

So:

• من الماء can be read as mina al-mā’i

This helps pronunciation and avoids an awkward consonant cluster.

In less formal pronunciation, learners often just say something closer to:

• min al-mā’

Both reflect the same underlying phrase.

الماء is the word for water, and it has a final hamza: ء.

That means the end is pronounced with a glottal stop:

• mā’

With case ending in careful reading, it becomes:

• al-mā’i after من

So the final sound is not just a long aa. There is a clear stop at the end.

Yes, but the structure changes.

You can say:

• أريد المزيد من الماء = I want more water
• أريد ماءً أكثر = I want more water

Both are correct, but they are built differently:

• المزيد من الماء = more of water
• ماءً أكثر = water, more

For learners, المزيد من + noun is a very useful and common pattern.

It is Modern Standard Arabic, so it is neutral to formal.

It is perfectly good Arabic for:

• writing
• news
• education
• formal speech
• textbook MSA

In everyday spoken dialects, people often say the same idea differently, but for MSA this sentence is completely natural.

Yes, but أريد المزيد من الماء is the most straightforward and natural order.

This is:

• verb + object + prepositional phrase

Arabic does allow some flexibility for emphasis, but for a learner, this version is the best one to use.

So stick with:

• أريد المزيد من الماء

Not really in the way English speakers might expect.

Here المزيد is not simply an adjective agreeing directly with الماء. It behaves more like a noun meaning:

• the additional amount
• more

Then من الماء explains more of what.

So the phrase is built as:

• المزيد
  • من الماء

That is why you should think of it as a fixed pattern rather than ordinary adjective agreement.

Yes. أريد ماءً أكثر is also good MSA.

The difference is mostly stylistic:

• أريد المزيد من الماء sounds very standard and formulaic
• أريد ماءً أكثر is also correct, but the first pattern is especially common in formal Arabic

Both mean essentially the same thing:

• I want more water