بدي مي اليوم.

A common Levantine pronunciation is:

biddi mayy il-yōm

A few notes:

• بدي = biddi
• مي is often pronounced mayy (pronunciation can vary a bit by region)
• اليوم = il-yōm or sometimes something close to lyōm in fast speech

So the whole sentence sounds roughly like:

BID-dee MAYY il-YOHM

بدي is the everyday Levantine way to say I want.

It is very common in spoken Arabic. You do not need a separate word for I in most cases, because بدي already tells you the speaker is I.

So:

• بدي = I want / I'd like
• بدك = you want
• بده = he wants
• بدها = she wants

This is one of the most useful colloquial patterns in Levantine.

Because بدي already includes the meaning of I.

So:

• بدي مي اليوم = natural everyday speech
• أنا بدي مي اليوم = also correct, but more emphatic

You would add أنا if you want contrast or emphasis, like:

• أنا بدي مي، مو عصير
  I want water, not juice

Without emphasis, leaving out أنا is normal.

Because this is Levantine Arabic, not Standard Arabic.

In Levantine, the everyday word is:

• مي = water

In Modern Standard Arabic, you usually learn:

• ماء

So if you are speaking naturally in Levantine, مي is the normal choice.

It can mean either, depending on context.

In Arabic, you often do not need a separate word like some. So:

• بدي مي can mean I want water
• and in natural English it may be translated as I want some water

That is very normal with mass nouns like water.

Because the sentence is talking about water in a general sense, not the water.

Compare:

• بدي مي = I want water / some water
• بدي المي = I want the water

So if you are just asking for water, مي without ال is the usual form.

Yes, the word order can change.

In this sentence:

• بدي مي اليوم = I want water today

Putting اليوم at the end is completely natural. But Arabic word order is flexible, so you could also say:

• اليوم بدي مي

That gives a little more focus to today.

Very roughly:

• بدي مي اليوم = neutral
• اليوم بدي مي = emphasizes today

Literally, اليوم is the day, but in actual usage it means today.

This is just how Arabic expresses today. So even though it contains الـ and looks literally like the day, you should learn اليوم as the normal word for today.

It most often means want, but in real conversation it can cover a range like:

• I want
• I’d like
• sometimes even I need, depending on context

So بدي مي could sound like:

• I want water
• I’d like some water

If you truly want to emphasize necessity, speakers may use other expressions too, but بدي is extremely common and flexible.

Yes, it is grammatical and understandable, but the word اليوم adds a specific time focus.

In many situations, if you are simply asking for water right now, people would just say:

• بدي مي

Adding اليوم makes it sound more like:

• I want water today
• as opposed to another day, or in contrast to something else

So it is natural, but a little more context-dependent than just بدي مي.

You usually add ما before بدي:

• ما بدي مي اليوم

That means:

• I don’t want water today

This is the normal simple negation pattern with بدي in Levantine.

You change بدي according to the person:

• بدي مي اليوم = I want water today
• بدك مي اليوم = you want water today
• بده مي اليوم = he wants water today
• بدها مي اليوم = she wants water today
• بدنا مي اليوم = we want water today
• بدكن مي اليوم = you all want water today
• بدهم مي اليوم = they want water today

This pattern is very useful, so it is worth memorizing early.