Ako sutra opet bude rasprodaja, kupit ćemo posteljinu i još jedno veliko pakiranje vode.

Because after ako when talking about a future condition, Croatian normally does not use the regular future with će.

So:

• Ako sutra opet bude rasprodaja... = If there is a sale again tomorrow...
• not usually Ako će sutra biti rasprodaja...

Here bude is the form Croatian commonly uses in this kind of future conditional clause. English uses present after if too: If there is a sale tomorrow..., not usually if there will be a sale. Croatian is doing something similar, but with its own grammar.

Rasprodaja means sale, often specifically a clearance sale or sell-off.

It is a bit stronger or more specific than:

• sniženje = discount / reduced prices
• akcija = special offer / promotion

So rasprodaja often suggests stock is being cleared out.

Opet means again.

So sutra opet bude rasprodaja means there is a sale again tomorrow or there is another sale tomorrow.

A near-synonym is ponovno. In many situations they are interchangeable:

• opet = again
• ponovno = again / anew

Opet often sounds a bit more everyday and conversational.

Because Croatian has no articles.

So Croatian does not have separate words for a/an and the. The context tells you whether something is indefinite or definite.

For example:

• bude rasprodaja can mean there is a sale
• kupit ćemo posteljinu can mean we’ll buy bedding / the bedding
• jedno veliko pakiranje vode = one large pack of water

English needs articles; Croatian usually does not.

Yes, both are possible.

Croatian future can be written in two common ways:

• kupit ćemo
• ćemo kupiti

They both mean we will buy.

What is happening here:

• infinitive: kupiti
• future auxiliary: ćemo

When the auxiliary comes after the infinitive, the final -i of kupiti drops:

• kupiti + ćemo → kupit ćemo

So kupit ćemo is completely normal and standard.

Because posteljinu is the direct object, so it must be in the accusative case.

The base form is:

• posteljina = bedding / bed linen

But as a feminine noun in -a, its accusative singular becomes -u:

• nominative: posteljina
• accusative: posteljinu

Since it is the thing being bought, Croatian uses the accusative:

• kupit ćemo posteljinu = we’ll buy bedding

Posteljina usually means bed linen or bedding.

It is often used as a collective / mass noun, so Croatian commonly uses it in the singular even though in English you might think of several items, such as sheets, pillowcases, and so on.

So:

• posteljina = bedding / bed linen
• not necessarily just one sheet

This is very normal in Croatian.

Here još jedno means another one or one more.

So:

• još jedno veliko pakiranje vode = another large pack of water / one more large pack of water

This is a very common use of još:

• još jedan = another one / one more (masculine)
• još jedna = another one / one more (feminine)
• još jedno = another one / one more (neuter)

By itself, još can also mean still, yet, or more, depending on context.

Because pakiranje is a neuter singular noun.

In Croatian, words that go with the noun must agree with it in gender, number, and case.

Since pakiranje is neuter, you get:

• jedno = neuter form of one
• veliko = neuter form of big

So:

• jedno veliko pakiranje

Compare:

• masculine: jedan veliki paket
• feminine: jedna velika boca
• neuter: jedno veliko pakiranje

It actually is in the accusative, but for this kind of noun the accusative looks the same as the nominative.

Here:

• nominative: pakiranje
• accusative: pakiranje

That is normal for many neuter inanimate nouns in Croatian.

So even though posteljina changes visibly to posteljinu, pakiranje stays the same in form.

The adjective matches it:

• veliko pakiranje in nominative
• veliko pakiranje in accusative

Same form, different function.

Because after a container-type noun such as pakiranje, Croatian usually puts the substance in the genitive.

So:

• pakiranje vode = a pack/package of water
• čaša vode = a glass of water
• boca vina = a bottle of wine

The base noun is:

• voda = water

But after pakiranje, it becomes genitive singular:

• vode

Literally, pakiranje can mean packaging or a pack/package, depending on context.

In this sentence it means a pack or a packaged unit of water, not the abstract idea of packaging.

So veliko pakiranje vode would naturally be understood as something like:

• a large pack of water
• a large package of bottled water
• a large water pack

The exact real-world image depends on context, such as whether the shop sells bottles in multi-packs.

Croatian word order is fairly flexible, but the version here is very natural:

• Ako sutra opet bude rasprodaja...

This puts:

• sutra = tomorrow
• opet = again

You could move them for emphasis, but it would slightly change the feel:

• Ako opet sutra bude rasprodaja...
• Ako bude opet rasprodaja sutra...

Those are possible, but the original sounds the most neutral and natural for everyday use.

Because the sentence begins with a subordinate ako clause:

• Ako sutra opet bude rasprodaja, ...

Croatian normally separates that clause from the main clause with a comma:

• condition first, result second

So the structure is:

• Ako ... , kupit ćemo ...

This is very similar to English punctuation in sentences like If it rains, we’ll stay home.