atarasii suihanki wo katta node, asa ha yakan de oyu wo wakasi nagara gohan wo youi dekimasu.

ので means because or since. It connects the reason to the result:

• 新しい炊飯器を買ったので = because I bought a new rice cooker
• 朝は…できます = in the morning, I can...

Compared with から, ので often sounds a little softer and more explanatory.

Because ので attaches to the plain form of the verb, not the -て form.

So:

• 買う → plain present
• 買った → plain past
• 買ったので = because I bought

買ってので is not correct.

In Japanese, clauses that come before another part of the sentence often use the plain form, even when the overall sentence is polite or neutral.

So 買ったので is completely normal.

You can also say 買いましたので, but that sounds more formal or stiff, and is more common in formal speech or writing.

朝は makes morning the topic: as for the morning / in the morning.

It can also carry a slight contrast, like:

• At least in the morning, I can do this
• or In the morning (as opposed to other times)

If you said 朝に, it would focus more simply on the time at morning, but 朝は sounds more natural here because the speaker is talking about their morning routine.

Here, で shows the tool or means used to do something.

• やかんで = with a kettle / using a kettle

So やかんでお湯を沸かし means boil water using a kettle.

This is the same kind of で as in:

• 箸で食べる = eat with chopsticks
• バスで行く = go by bus

ながら means while doing... It connects two actions happening at the same time.

• お湯を沸かしながら = while boiling water
• ご飯を用意できます = I can prepare the rice/meal

So the speaker is saying they can do one action while doing the other.

The basic pattern is:

• verb stem + ながら

Examples:

• 音楽を聞きながら勉強する = study while listening to music
• 歩きながら話す = talk while walking

Because 沸かす and 沸く are different verbs:

• 沸かす = to boil something / to bring something to a boil
  
  • transitive
• 沸く = to boil / to come to a boil
  
  • intransitive

Here the sentence has a direct object:

• お湯を沸かす = boil water

So the correct form is:

• 沸かしながら

If you used 沸く, the water itself would be the thing that boils:

• お湯が沸く = the water boils

Yes, usually the same subject does both actions with ながら.

So in this sentence, the implied subject is the same person for both:

• boiling water
• preparing the rice/meal

Even though Japanese does not say I explicitly, the listener naturally understands that the speaker is the one doing both actions.

用意する means to prepare / get ready.

So ご飯を用意できます means something like:

• I can prepare the rice
• I can get the meal ready
• I can have the food ready

ご飯 can mean:

• cooked rice
• or more broadly a meal

Because the sentence mentions a rice cooker, many learners will first think of rice, but depending on context it could also feel a little broader, like getting breakfast ready.

Japanese often leaves out the subject when it is clear from context.

In English, you usually need to say:

• I bought
• I can prepare

In Japanese, that is often unnecessary if the listener can easily tell who is meant.

So this sentence naturally omits 私は or 僕は, but the meaning is still understood.

Because there are two different verbs, and each verb has its own direct object:

• 炊飯器を買った = bought a rice cooker
• お湯を沸かしながら = while boiling water
• ご飯を用意できます = can prepare the rice/meal

Each を belongs to its own verb, so having more than one を in a sentence is completely normal in Japanese.