Czy w tej toalecie jest papier i mydło, czy muszę iść do drugiej?

The first czy marks the whole sentence as a question. It often introduces a yes/no question.

The second czy links the two alternatives and works like or in English.

So the pattern is:

Czy X, czy Y? = Is it X, or is it Y?

In this sentence:

• Czy w tej toalecie jest papier i mydło... = Is there paper and soap in this toilet...
• ..., czy muszę iść do drugiej? = ..., or do I have to go to the other one?

Because w meaning in takes the locative case when it refers to location.

The basic form is:

• ta toaleta = this toilet / this restroom

But after w, it changes:

• w tej toalecie = in this toilet / in this restroom

So both words change:

• ta → tej
• toaleta → toalecie

This is a very common pattern in Polish:

• w tej szkole = in this school
• w tej restauracji = in this restaurant

This is because Polish often uses singular jest in there is/there are type sentences, especially when talking about the presence or availability of things rather than treating them as a grammatical subject in the usual way.

So:

• jest papier i mydło sounds natural
• it means that paper and soap are available there

Also, papier and mydło are being presented as items found in the restroom, not as a normal plural subject at the start of the sentence.

A learner should remember that existential sentences in Polish often work a bit differently from English there is / there are.

They are singular because the speaker is talking about the substances or items in a general sense, not about multiple separate pieces.

Compare:

• papier = toilet paper / paper
• mydło = soap

This is similar to English, where we often say Is there soap? rather than Are there soaps?

So Polish uses the singular forms naturally here.

Polish does not have articles like English a/an and the.

That means Polish simply says:

• w tej toalecie jest papier i mydło

and context tells you whether English should use a, the, or no article at all.

This is normal in Polish. Learners often want to insert an article mentally, but Polish does not need one.

The noun is omitted because it is understood from context.

The full version would be:

• do drugiej toalety = to the other toilet/restroom

But Polish often leaves out the noun if it is obvious:

• do drugiej = to the other one

This is very common and natural.

Also, do requires the genitive case, so:

• druga toaleta becomes drugiej toalety
• when toalety is omitted, only drugiej remains

So do drugiej literally means to the other [one].

Because do takes the genitive case, not the accusative.

Here is the base form:

• druga toaleta = the second / other toilet

After do, it changes to genitive:

• do drugiej toalety

If you remove toalety, you still keep the genitive form:

• do drugiej

drugą would be accusative, and that would not fit after do.

In everyday Polish, toaleta usually means the restroom / bathroom / toilet room, depending on context.

In this sentence, it clearly means the place or stall/room the speaker is in, not just the toilet bowl itself.

So here w tej toalecie means something like:

• in this restroom
• in this toilet
• possibly in this stall, depending on context

English chooses the best wording based on the situation.

muszę means I must / I have to, and iść means to go in the sense of a single movement on foot.

So muszę iść is the natural way to say:

• I have to go

It suggests going somewhere now, in this specific situation.

That fits the sentence well, because the speaker is deciding whether they need to go to another restroom.

Yes, Polish word order is fairly flexible, but the version here is very natural.

Czy w tej toalecie jest papier i mydło, czy muszę iść do drugiej?

This order sounds good because:

• w tej toalecie sets the location early
• jest papier i mydło gives the important information
• the second half then gives the alternative

Other word orders may be possible, but this one is clear and idiomatic.

Grammatically, drugi / druga / drugie often means second, but in many everyday contexts it also means the other.

So here:

• do drugiej does not usually mean to the second one in a numbered sequence
• it more naturally means to the other one

Polish often uses drugi this way when there are two available options.