Made of and used for (z bawełny, do kawy)

What it is made of: z + Genitive

A material attaches to its noun with z + Genitive:

I bought a cotton shirt.
Kupiłam koszulę z bawełny.
This handbag is made of leather.
Ta torebka jest ze skóry. — **ze** before an s-cluster, as usual.
This sweater is made of wool, and this shirt of cotton.
Ten sweter jest z wełny, a ta koszula z bawełny.

What it is for: do + Genitive

A purpose attaches with do + Genitive:

This is a coffee cup.
To jest filiżanka do kawy. — a cup FOR coffee, a coffee cup.
The wine glasses are standing on the table.
Szklanki do wina stoją na stole.

For it — or full of it?

Do not confuse the purpose with the content. The bare Genitive you know from quantities names what is IN it:

szklanka do winaa wine glass (empty is fine)
szklanka winaa glass of wine
I am drinking a glass of water.
Piję szklankę wody.

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