Portakal suyu içince kendimi daha iyi hissediyorum.

Portakal suyu is the normal Turkish way to say a compound noun like orange juice.

This pattern is very common:

• elma suyu = apple juice
• domates çorbası = tomato soup
• köy ekmeği = village bread

In this structure:

• the first noun stays bare: portakal
• the second noun takes a compound ending: su + yu

So portakal suyu means orange juice as a type of drink.

By contrast, portakalın suyu means something more like the juice of the orange or the orange’s juice, referring to a specific orange.

İçince comes from the verb içmek, meaning to drink.

It is formed like this:

• dictionary form: içmek
• verb stem: iç-
• add -ince → içince

This ending often means:

• when
• once
• after

depending on context.

So içince is a very common way to say something like:

• when I drink
• when one drinks
• after drinking

The subject is often understood from the rest of the sentence.

It can mean either, depending on context.

In many sentences, -ince / -ınca covers the idea of:

• when
• once
• after

For this sentence, English might naturally translate it as either:

• When I drink orange juice, I feel better
• After I drink orange juice, I feel better

If you want a more explicitly after meaning, Turkish often uses -dikten sonra:

• Portakal suyu içtikten sonra...

That sounds a bit more explicitly sequential: first I drink it, then I feel better.

İçince is shorter and very natural.

Turkish commonly uses kendini hissetmek for to feel oneself / to feel in the sense of health, mood, or condition.

So:

• kendimi iyi hissediyorum = I feel well
• literally, something like I feel myself well

That is why kendimi appears here.

If you leave it out and just say daha iyi hissediyorum, it can still be understood in some contexts, but kendimi daha iyi hissediyorum is the standard, complete pattern.

Because the subject and the object are the same person.

• subject: I
• object: myself

Turkish uses kendi as the reflexive word:

• kendim = myself
• kendin = yourself
• kendisi = himself/herself/themselves politely

Here it becomes kendimi because it is in the accusative case.

So:

• kendimi hissediyorum = I feel myself
• beni hissediyorum would not be the natural standard way to say this

That -i is the accusative ending.

The base form is kendim = myself.

Then Turkish adds the accusative because hissetmek in this pattern takes a direct object:

• kendim → kendimi

So the structure is:

• kendimi iyi hissediyorum
• literally: I am feeling myself well

This is one of those patterns that learners usually need to memorize as a chunk: kendini iyi hissetmek = to feel well

Daha iyi means better.

• iyi = good / well
• daha iyi = better

So the sentence is not just saying I feel well, but I feel better.

Some useful comparisons:

• iyi hissediyorum = I feel well
• daha iyi hissediyorum = I feel better
• çok daha iyi hissediyorum = I feel much better

The dictionary form is hissetmek.

When Turkish adds a vowel-initial ending, the t often becomes d in pronunciation and spelling. So:

• hissetmek
• hissediyorum

This is very common with similar verbs:

• affetmek → affediyorum
• kaybetmek → kaybediyorum

So hissediyorum is the normal conjugated form.

Because the verb ending already tells you.

Hissediyorum contains the first-person singular ending:

• -yorum = I am ... / I ...

So Turkish usually does not need the pronoun ben unless you want emphasis or contrast.

For example:

• Kendimi daha iyi hissediyorum = I feel better
• Ben kendimi daha iyi hissediyorum = I feel better, with extra emphasis on I

Turkish often drops subject pronouns because the verb gives the information.

It can be understood as a general habit or usual result.

The form hissediyorum with -yor does not only mean something happening at this exact moment. In Turkish, -yor is also often used for:

• habits
• general tendencies
• things that usually happen

So this sentence can naturally mean:

• whenever I drink orange juice, I feel better
• drinking orange juice makes me feel better

Context decides whether it is a current situation or a usual one.

Yes, Turkish word order is flexible, but this order is very natural.

The first part, Portakal suyu içince, is a time-related clause, so putting it first is very common:

• Portakal suyu içince kendimi daha iyi hissediyorum

This is similar to starting an English sentence with When I drink orange juice...

The rest also follows a common Turkish pattern:

• kendimi = object
• daha iyi = description
• hissediyorum = verb at the end

You can move things for emphasis, but this version is neutral and natural.

Yes. That is also correct.

Both are natural:

• Portakal suyu içince...
• Portakal suyu içtiğimde...

Very roughly:

• içince often feels a bit more like when/once/after drinking
• içtiğimde often feels more like when I drink / when I am in the situation of drinking

In many everyday contexts, the difference is small, and both can work.

For a learner, it is useful to remember that -ince is a very common and compact way to express this kind of when clause.