Zanim usiądziemy do kolacji, wyjmę sztućce z szuflady i postawię wodę na stole.

Zanim means before and introduces a subordinate clause.

So the structure is:

• Zanim usiądziemy do kolacji = before we sit down to dinner
• wyjmę sztućce... = I will take out the cutlery...

Polish uses a comma to separate this kind of subordinate clause from the main clause, just as English often does.

Usiądziemy comes from usiąść, which means to sit down or to take a seat. It describes a completed action: the moment when we sit down.

By contrast:

• siedzieć = to be sitting
• siedzimy = we are sitting

So zanim usiądziemy do kolacji means before we sit down to dinner, not before we are sitting.

Because usiąść is a perfective verb. In Polish, perfective verbs do not have a true present tense. Their present-looking forms usually refer to the future.

So:

• usiądziemy = we will sit down
• wyjmę = I will take out
• postawię = I will place / set

This is very normal in Polish. With perfective verbs, the simple form often gives a future meaning.

This is a very common Polish pattern:

• usiąść do + genitive

It means to sit down to something, especially a meal or an activity.

So:

• usiąść do kolacji = sit down to dinner
• usiąść do obiadu = sit down to lunch
• usiąść do pracy = sit down to work

Here kolacji is the genitive singular form of kolacja, because do takes the genitive.

Because usiąść do kolacji is the idiomatic expression for sit down to dinner.

Na kolację usually means for dinner or as dinner, for example:

• Co jecie na kolację? = What are you having for dinner?

So after usiąść, do kolacji is the natural choice.

Polish often leaves subject pronouns out because the verb ending already tells you who the subject is.

Here:

• usiądziemy = we will sit down
• wyjmę = I will take out
• postawię = I will set

Adding ja or my is possible, but it usually adds emphasis or contrast.

Sztućce means cutlery or silverware.

In everyday use, it is very often plural because people usually mean the set of eating utensils together. There is also a singular form:

• sztuciec = one piece of cutlery, such as a fork or knife

So in this sentence, sztućce means the cutlery in general.

Both verbs can involve taking something out, but they are not identical.

• wyjąć = take out, remove
• wyciągnąć = pull out, draw out

With things taken from a drawer, box, bag, and so on, wyjąć is often the most neutral and natural choice. Wyciągnąć can sound a bit more physical, as if you are pulling something out.

So wyjmę sztućce z szuflady is the most idiomatic wording here.

The preposition z here means out of / from and takes the genitive case.

So:

• szuflada = drawer
• z szuflady = out of the drawer / from the drawer

This is a very common pattern:

• z domu = from the house
• z torby = from the bag
• z szuflady = from the drawer

Because wodę is the accusative singular form of woda, and it is the direct object of postawię.

• woda = nominative
• wodę = accusative

Also, in a sentence like this, wodę usually means something like a bottle, jug, or glass of water. Polish often names the contents rather than the container.

So it does not suggest pouring water directly onto the table.

Na stole means on the table.

• stół = table
• na stole = on the table

With postawić, this phrase is completely natural and idiomatic: postawić wodę na stole means to set the water on the table. The focus is on the final location.

The word order can be changed, because Polish word order is fairly flexible. The version in the sentence is a neutral, natural one.

For example, you could also say:

• Zanim usiądziemy do kolacji, postawię wodę na stole i wyjmę sztućce z szuflady.
• Sztućce wyjmę z szuflady, zanim usiądziemy do kolacji.

Changing the order usually changes emphasis, not the basic meaning.