Al supermercato prendo una confezione di pasta e una di biscotti.

Because al is the normal contraction of a + il.

• a = at / to
• il supermercato = the supermarket
• a + il = al

So al supermercato means at the supermarket (or sometimes to the supermarket, depending on context).

This kind of contraction is very common in Italian:

• a + il = al
• a + lo = allo
• a + la = alla
• a + i = ai
• a + gli = agli
• a + le = alle

Prendo is the first person singular of the verb prendere.

So:

• prendere = to take
• prendo = I take / I’m taking

In a sentence like this, it can sound like:

• a habitual action: At the supermarket, I take...
• a step in a sequence: At the supermarket I pick up...

Italian often uses the present tense in places where English might also use I take, I’m taking, or even a kind of narrative present.

Because prendere and comprare are related but not identical.

• prendere = to take / pick up
• comprare = to buy

In a supermarket context:

• prendo una confezione di pasta = I pick up a pack of pasta
• compro una confezione di pasta = I buy a pack of pasta

So prendo focuses on the action of taking the item from the shelf, while compro focuses on purchasing it.

Confezione means something like package, pack, packet, or box, depending on context.

It is a feminine noun, which is why the sentence has:

• una confezione

not

• un confezione

So:

• una confezione di pasta = a pack/package of pasta
• una confezione di biscotti = a pack/package of cookies/biscuits

Here di means of and links the container to what it contains.

So:

• una confezione di pasta = a package of pasta
• una confezione di biscotti = a package of cookies

This is a very common pattern in Italian:

• una bottiglia di acqua = a bottle of water
• una tazza di caffè = a cup of coffee
• un chilo di mele = a kilo of apples

Because Italian often avoids repeating a noun that is already understood.

In the sentence:

• una confezione di pasta e una di biscotti

the second una really means:

• una confezione

So the full idea is:

• una confezione di pasta e una confezione di biscotti

But Italian naturally shortens it to:

• una confezione di pasta e una di biscotti

This is very common and sounds more natural than repeating the whole noun.

Because di is still needed to connect the omitted noun to what follows.

The hidden structure is:

• una [confezione] di biscotti

Even though confezione is omitted, the di stays because it belongs to the pattern confezione di + noun.

So:

• una di biscotti = one (package) of cookies

You can think of it as English one of cookies if taken literally, but in natural English we would say one package of cookies or simply a pack of cookies.

After a container noun like confezione, Italian usually uses di + noun without an article when talking about the type or contents in a general way.

So these are normal:

• una confezione di pasta
• una confezione di biscotti
• una scatola di cioccolatini

Adding an article would usually change the feel or make it more specific, and here it is not needed.

Because they are being viewed differently.

• pasta is often treated like a mass noun here: pasta as a product/category
• biscotti is plural because a pack contains multiple individual biscuits/cookies

So:

• una confezione di pasta = a package containing pasta
• una confezione di biscotti = a package containing several cookies/biscuits

This difference is very normal.

In Italian, biscotti is the ordinary plural of biscotto and usually means biscuits/cookies in general.

So in this sentence, biscotti does not necessarily mean the specific English borrowed word biscotti (the almond-style twice-baked cookies). It simply means cookies/biscuits.

Because Italian often puts a place expression at the beginning to set the scene.

So:

• Al supermercato prendo una confezione di pasta...

means something like:

• At the supermarket, I pick up a pack of pasta...

This word order is completely natural. It highlights where the action happens first.

You could also say:

• Prendo una confezione di pasta e una di biscotti al supermercato

but starting with Al supermercato sounds very natural when giving context first.

In this sentence, it is most naturally understood as at the supermarket because it tells you where the action prendo happens.

So:

• Al supermercato prendo... = At the supermarket, I take/pick up...

If the meaning were clearly to the supermarket, Italian would usually need a different structure, depending on the full sentence.

Yes, it can be either, depending on context.

The Italian present tense is flexible. So this could mean:

• When I’m at the supermarket, I pick up a pack of pasta and one of cookies (habit/routine)
• At the supermarket, I’m picking up a pack of pasta and one of cookies (right now, in a narrative sense)

Without more context, both are possible.