Раз уж у нас есть соковыжималка, утром лучше сделать свежий сок, а не покупать сладкую газировку.

Раз уж is a conversational expression meaning something like since, seeing that, or given that.

So:

Раз уж у нас есть соковыжималка
= Since we have a juicer / Seeing that we have a juicer

It often suggests: this fact is already true, so we should act accordingly.

It is a bit more expressive than just раз or поскольку.

In Russian, possession is often expressed with the pattern:

у + genitive + есть + thing

So:

• у нас = with us / at our place
• есть = there is / exists
• соковыжималка = a juicer

Together:

У нас есть соковыжималка = We have a juicer

Russian does not usually use a verb directly equivalent to English have in this kind of sentence.

Also, есть is often omitted in the present tense in some contexts, but in possession sentences it is very common and natural.

Because у нас есть... is the normal everyday way to say we have... in Russian.

Мы имеем literally means we have, but it sounds formal, bookish, or sometimes unnatural in ordinary conversation.

So a native speaker would normally say:

• У меня есть машина = I have a car
• У нас есть соковыжималка = We have a juicer

not usually:

• Мы имеем соковыжималку

It is genitive.

The preposition у requires the genitive case when it means at someone's place / by someone / in someone's possession.

Examples:

• у меня
• у тебя
• у него
• у нас

So:

• мы = nominative
• нас = genitive/accusative form

Here it is specifically genitive because it follows у.

Утром is the instrumental case of утро and is commonly used as an adverbial expression meaning in the morning.

So:

• утро = morning
• утром = in the morning

Russian often uses time expressions without a preposition:

• утром = in the morning
• днём = during the day
• вечером = in the evening
• ночью = at night

This is a very common pattern and should be learned as a set of natural time expressions.

Here лучше means it is better to...

Russian often uses:

лучше + infinitive

So:

• лучше сделать = it is better to make
• лучше купить = it is better to buy
• лучше подождать = it is better to wait

In this sentence, the subject is general or understood from context, so Russian does not need to say нам or мы explicitly.

You could also say:

Нам лучше сделать свежий сок
= We’d better make fresh juice

But omitting нам is very natural here.

Because сделать is perfective, and here the speaker means make a serving of juice as a completed action.

Compare:

• делать = to do / to make, process, repeated or ongoing action
• сделать = to do / to make, completed result

In this sentence, the idea is:

In the morning, it’s better to make some fresh juice
meaning prepare it once, successfully, as a finished action.

That is why сделать sounds right.

If you used делать, it would sound more like a general activity or repeated process, which is less natural here.

Here покупать is imperfective, and it fits the idea of buying soda as a general habit or option.

The contrast is:

• сделать свежий сок = make fresh juice as one completed action
• не покупать сладкую газировку = not buy sweet soda, as a general thing to do

Russian often uses the imperfective after лучше when talking about what is generally preferable behavior.

So the sentence is not just about one specific purchase, but more about what is better to do instead of the usual option of buying soda.

That said, in some contexts купить could appear, but покупать sounds very natural here because it presents buying soda as the alternative practice.

In this sentence, а не means and/or rather than, instead of, and it sets up a contrast between two alternatives:

• сделать свежий сок
• покупать сладкую газировку

So:

..., а не покупать сладкую газировку
= ..., rather than buy sugary soda

Но means but, while а often marks a contrast between two parallel ideas.

Here а не is the natural choice because the sentence contrasts one better option with another option.

Because they are the direct objects of the infinitives:

• сделать что? → свежий сок
• покупать что? → сладкую газировку

For inanimate nouns:

• masculine accusative singular often looks like nominative
  
  • свежий сок (same as nominative)
• feminine accusative singular usually changes -а to -у
  
  • сладкая газировка → сладкую газировку

So:

• свежий сок = accusative masculine inanimate
• сладкую газировку = accusative feminine singular

Because газировка is feminine singular, and it is in the accusative case.

Adjectives must agree with the noun in gender, number, and case.

Base form:

• сладкая газировка = sweet soda

Accusative singular feminine:

• сладкую газировку

So both words change:

• сладкая → сладкую
• газировка → газировку

Газировка is a common, informal everyday word for carbonated soft drink / soda.

Related words:

• газированная вода = carbonated water / sparkling water
• сладкая газировка = sweet soda / sugary soft drink

So газировка is often broader and more colloquial, especially when talking about drinks like soda sold in bottles or cans.

In this sentence, сладкая газировка clearly means sweet fizzy soda, not just plain sparkling water.

Yes, соковыжималка is a completely normal word meaning juicer.

It is built from:

• сок = juice
• выжимать = to squeeze out
• -лка / -алка = a common ending for tools or devices

So literally it is something like juice-squeezer.

Russian often forms practical device words this way.

Yes, Russian word order is flexible, but the given order sounds natural and clear.

Current sentence:

Раз уж у нас есть соковыжималка, утром лучше сделать свежий сок, а не покупать сладкую газировку.

This order works well because:

1. Раз уж у нас есть соковыжималка gives the reason first.
2. утром лучше сделать свежий сок gives the recommendation.
3. а не покупать сладкую газировку adds the contrasting alternative.

You could move some parts around, but the emphasis would change. For example:

• Утром, раз уж у нас есть соковыжималка, лучше сделать свежий сок...
• Лучше утром сделать свежий сок...

These are possible, but the original version is very natural as written.

In this context, свежий сок strongly suggests freshly made juice, especially because the sentence mentions a juicer.

Without context, свежий сок could sometimes just mean fresh juice in a general sense, but here the logic is:

• we have a juicer
• so it is better to make fresh juice

That makes it clear the speaker means juice made fresh, not packaged juice from a store.