في الثلاجة فاكهة وتفاح وماء.

In Arabic, the present tense often uses a nominal sentence, so there is no separate word for is or are.

So في الثلاجة فاكهة وتفاح وماء literally looks like:

in the fridge fruit and apples and water

but it naturally means:

There is fruit, apples, and water in the fridge
or
In the fridge, there is fruit, apples, and water.

This is completely normal in Modern Standard Arabic.

Arabic does not need a dummy subject like English there.

Instead, Arabic often expresses existence by putting a location first, then an indefinite noun:

في الثلاجة فاكهة = There is fruit in the fridge

The idea of there is/there are is understood from the structure itself. Arabic can use هناك in some contexts, but it is not required here.

Beginning with في الثلاجة puts the location first: in the fridge.

This is a very common Arabic pattern for saying that something exists somewhere:

في + place + thing

So:

في الثلاجة فاكهة
literally: In the fridge [there is] fruit

This word order is especially common when introducing what is present in a place.

الثلاجة means the fridge. It has الـ because it refers to a specific, identifiable refrigerator in the context.

Also, after the preposition في (in), the noun is in the genitive case, so the fully vowelled form is:

في الثلاجةِ

In normal writing, those short case vowels are usually omitted, so you just see في الثلاجة.

They are indefinite because they are being introduced as things that are present in the fridge, not as already identified items.

This is very common in Arabic existential sentences:

• في الثلاجة فاكهة = There is fruit in the fridge
• الفاكهة في الثلاجة = The fruit is in the fridge

That second sentence is different: it talks about a specific fruit already known in the conversation.

So in your sentence, the pattern is:

• definite place: الثلاجة
• indefinite things being introduced: فاكهة، تفاح، ماء

If fully vowelled, the sentence would be:

في الثلاجةِ فاكهةٌ وتفاحٌ وماءٌ

Here is why:

• في is a preposition, so الثلاجةِ is genitive
• فاكهةٌ, تفاحٌ, and ماءٌ are nominative

In traditional grammar, في الثلاجةِ is the predicate placed first, and the nouns after it are the delayed subject.

In everyday printed Arabic, these endings are usually not written, so learners have to infer them from the structure.

Because فاكهة can function like a generic noun in Arabic.

English often uses mass nouns like fruit, and Arabic may use a singular form in a similar general sense. So فاكهة here does not have to mean just one fruit. It can mean fruit in a general category sense.

So in this sentence, فاكهة is best understood as fruit, not necessarily a single piece of fruit.

Here it is best understood as apples in a general or collective sense.

Like some other food words in Arabic, تفاح is often used as a category word, not just for one individual item. So in a list of things in a fridge, تفاح naturally means apples.

If you wanted to be more explicitly countable, Arabic also has تفاحات for apples, but تفاح is very normal when talking about apples as a type of food.

Arabic commonly repeats و (and) in lists:

فاكهة وتفاح وماء

This is normal style. Arabic can also use commas in modern writing, but repeating و is very common and natural.

So this structure is not unusual at all. It simply links each item in the list.

Grammatically, yes, it is fine.

Semantically, it is a little redundant, because تفاح is one kind of فاكهة. In real-life speech or writing, a person might more naturally say either:

• في الثلاجة فاكهة وماء
• في الثلاجة تفاح وماء

But language-learning examples often list categories and items together for simplicity or vocabulary practice. So the sentence is correct, even if slightly repetitive in meaning.

A careful full pronunciation would be:

fī ath-thallājati fākihatun wa tuffāḥun wa mā’un

A few notes:

• الثلاجة is pronounced with assimilation of الـ because ث is a sun letter, so al-th... becomes ath-th...
• In normal pausal pronunciation, the final case endings are often not fully pronounced

So in slower everyday reading, you may hear something closer to:

fī th-thallāja fākihah wa tuffāḥ wa mā’

Both reflect the same sentence; the difference is mainly whether full case endings are being pronounced.