Når vi har brød, ost og lidt frugt, behøver vi ikke købe hvad som helst i kiosken på stationen.

Når means when or whenever here. It is often used for something that is expected, typical, or repeated.

So Når vi har brød, ost og lidt frugt ... suggests something like when/whenever we have bread, cheese, and a little fruit...

If you used Hvis, the meaning would be more like if: a more open condition, not something presented as normal or expected.

So the contrast is roughly:

• Når vi har ... = when/whenever we have ...
• Hvis vi har ... = if we have ...

This is because Danish main clauses normally follow the V2 rule: the finite verb comes in the second position.

The first position here is the whole subordinate clause:

Når vi har brød, ost og lidt frugt

After that, the main clause starts, and the finite verb must come next:

behøver vi ikke købe ...

If the sentence started directly with the subject, it would be:

Vi behøver ikke købe hvad som helst i kiosken på stationen.

But because the Når-clause comes first, the verb and subject switch order.

The comma separates the opening subordinate clause from the main clause.

So:

• subordinate clause: Når vi har brød, ost og lidt frugt
• main clause: behøver vi ikke købe hvad som helst i kiosken på stationen

In Danish, this kind of clause boundary is commonly marked with a comma.

Because these words are being used as mass nouns or as food in a general sense.

So:

• brød = bread
• ost = cheese
• frugt = fruit

Just like in English, you often do not need an article with words like bread or cheese when talking about some amount in general.

Compare:

• Vi har brød. = We have bread.
• Vi har en ost. = We have a cheese / a whole cheese.

In this sentence, the speaker is just referring to food available, not counting individual items.

Lidt means a little or some.

So lidt frugt means a little fruit or some fruit.

It is used with uncountable or mass nouns. That makes it a natural choice with frugt here, where fruit is being treated as a general food category rather than as countable individual fruits.

Compare:

• lidt frugt = some fruit
• nogle frugter = some fruits

Both are possible in Danish, but they are not exactly the same in style or focus.

With behøve meaning need to, Danish often uses it with a bare infinitive, especially in negative sentences:

• Du behøver ikke komme. = You do not need to come.
• Vi behøver ikke købe ... = We do not need to buy ...

So behøver ikke købe is completely normal.

You may also sometimes hear behøver ikke at købe, but leaving out at is very common and natural here.

In a main clause, Danish usually places sentence adverbs like ikke after the finite verb and subject, but before the infinitive or the rest of the verb phrase.

Here the finite verb is behøver, so the pattern is:

behøver + subject + ikke + infinitive

That gives:

behøver vi ikke købe

If you put the subject first, it would be:

Vi behøver ikke købe ...

So ikke is in a normal Danish position.

Hvad som helst means anything, whatever, or just anything at all, depending on context.

In this sentence, it means that they do not need to buy random or unrestricted things from the kiosk.

So the idea is:

we do not need to buy just anything / whatever happens to be available

The expression som helst adds the sense of at all or no matter what.

Some similar expressions are:

• hvem som helst = anyone
• hvor som helst = anywhere
• når som helst = anytime

This is about Danish prepositions, which often do not match English exactly.

• i kiosken = in the kiosk / at the kiosk
• på stationen = at the station

I is often used for being in or at an enclosed place or shop.

På is idiomatic with certain locations and institutions, and station is one of the places where Danish commonly uses på.

So på stationen is the natural way to say at the station.

If you said i stationen, it would sound more like inside the station building, which is more literal and less idiomatic in many contexts.

Because Danish usually marks the definite form by adding an ending to the noun.

So:

• en kiosk = a kiosk
• kiosken = the kiosk

and

• en station = a station
• stationen = the station

This is different from English, which uses a separate word, the.

So in this sentence:

• i kiosken = in the kiosk / at the kiosk
• på stationen = at the station

It can very naturally mean a general or repeated situation.

So the sentence can be understood as something like:

Whenever we have bread, cheese, and some fruit, we do not need to buy just anything at the station kiosk.

This is one of the common uses of når in Danish: it often introduces habits, general truths, or situations that occur repeatedly.

If the context were very specific, it could also refer to a particular future occasion, but without more context, the sentence sounds quite general.