Воду для чая не стоит кипятить два раза подряд.

Because воду is the accusative singular of вода.

In this sentence, the water is the direct object of the verb кипятить (to boil something), so Russian uses the accusative:

• вода = water (dictionary form, nominative)
• кипятить воду = to boil water

So:

• Вода кипит. = The water is boiling.
• Я кипячу воду. = I am boiling water.

The first has вода as the subject, while the second has воду as the object.

Чая is the genitive singular of чай.

The preposition для always requires the genitive case, and it usually means for.

So:

• для чая = for tea
• для кофе = for coffee
• для супа = for soup

Here, воду для чая means water for tea.

Не стоит + infinitive is a very common Russian way to say:

• it’s not worth ...
• one shouldn’t ...
• it’s better not to ...

So:

• не стоит кипятить = it’s not worth boiling / you shouldn’t boil

This is usually softer and more polite than a direct prohibition like нельзя.

Compare:

• Не стоит кипятить воду два раза. = You shouldn’t boil water twice.
• Нельзя кипятить воду два раза. = You must not / it is not allowed to boil water twice.

So не стоит sounds more like advice or recommendation.

Because кипятить means to boil something, while кипеть means to boil in the sense of to be boiling.

This is an important distinction:

• вода кипит = the water is boiling
• кипятить воду = to boil water

In your sentence, someone is doing something to the water, so Russian uses the transitive verb кипятить.

Russian often uses the imperfective infinitive after не стоит when talking about a general action, habit, or recommendation.

Here the sentence is about the general practice of boiling water again, so кипятить sounds natural.

A rough contrast:

• не стоит кипятить = you shouldn’t boil (general advice / process / repeated action)
• не стоит вскипятить would not work here

A better perfective comparison would be something like вскипятить воду = to bring water to a boil, but in this sentence the focus is not on a single completed result. It is on the act of boiling water again, so кипятить is the normal choice.

Два раза подряд means twice in a row or two times consecutively.

Breakdown:

• два раза = two times
• подряд = in a row / consecutively

So два раза подряд means that the same action happens two times one after the other, without interruption.

Examples:

• Он выиграл два раза подряд. = He won twice in a row.
• Не делай это три раза подряд. = Don’t do that three times in a row.

After два, Russian uses a special counting pattern. With many masculine nouns, you get a form that looks like the genitive singular.

So:

• один раз
• два раза
• три раза
• четыре раза
• пять раз

This is just the normal counting pattern and is something learners mostly need to memorize.

So два раза подряд is completely standard.

Yes. Russian often leaves the subject unstated in general advice.

So Воду для чая не стоит кипятить два раза подряд does not name a specific person. It means something like:

• One shouldn’t boil water for tea twice in a row
• You shouldn’t boil water for tea twice in a row

This is very common in Russian when giving general recommendations.

Yes. Russian word order is flexible, and several versions are possible.

For example:

• Воду для чая не стоит кипятить два раза подряд.
• Не стоит кипятить воду для чая два раза подряд.

Both are natural.

The version with Воду для чая first puts that phrase in focus as the topic: as for water for tea, you shouldn’t boil it twice in a row.

The version beginning with Не стоит sounds a bit more neutral as straightforward advice.

In this sentence, it clearly means in a row / consecutively.

That is the most common everyday meaning of подряд in phrases like:

• два дня подряд = two days in a row
• три раза подряд = three times in a row

In other contexts, подряд can also appear in business or technical language related to contracting, but that is a completely different usage and not relevant here.

You could say дважды, but it would not mean exactly the same thing.

• дважды = twice
• два раза подряд = twice in a row

So:

• Воду для чая не стоит кипятить дважды. = You shouldn’t boil water for tea twice.
• Воду для чая не стоит кипятить два раза подряд. = You shouldn’t boil water for tea twice in a row.

The version with подряд specifically emphasizes that the boiling happens consecutively.

It normally implies the same water being boiled a second time.

That idea comes from the context and from два раза подряд. In natural usage, the sentence is understood as advice against boiling already-boiled water again for tea.

Russian does not need to explicitly say ту же самую воду here, because the meaning is already clear from the situation.

Yes, that is a very close literal reading.

Word by word:

• Воду = water
• для чая = for tea
• не стоит = it is not worth / one shouldn’t
• кипятить = to boil
• два раза подряд = twice in a row

So the structure is very close to:

Water for tea is not worth boiling twice in a row.

But in natural English, we usually say:

You shouldn’t boil water for tea twice in a row.

So the Russian is fairly transparent once you understand the cases and the phrase не стоит + infinitive.