Я возьму какой угодно чай, только не слишком крепкий.

Возьму is the 1st person singular future of взять (to take, perfective).

Russian often uses a perfective verb in the future when talking about a single completed action in the future:

• Я возьму чай = I’ll take tea / I’ll have tea

A native English speaker may expect something like я буду брать, but that would sound different and usually would not fit this situation. Возьму is the normal choice when you mean one decision or one act of choosing/taking something.

Какой угодно means something like:

• any kind of
• whatever kind of
• it doesn’t matter which kind of

So какой угодно чай means any tea / whatever tea you have, with the idea that the speaker is not picky about the type.

This expression is very common in Russian. It changes form to match the noun:

• какой угодно чай — any tea
• какая угодно книга — any book
• какое угодно место — any place
• какие угодно вопросы — any questions

They are often very close in meaning, and in many situations either can work:

• любой чай
• какой угодно чай

Both can mean any tea.

But there is a slight nuance:

• любой often sounds more neutral and compact: any / any one
• какой угодно can sound a bit more emphatic: absolutely any kind, I don’t care which

So in this sentence, какой угодно чай gives a nice sense of I’m fine with whatever tea, while the second part adds the only restriction: just not too strong.

Because чай is the direct object of возьму, and with an affirmative perfective verb, the direct object is normally in the accusative.

For an inanimate masculine noun like чай, the accusative singular looks the same as the nominative singular:

• nominative: чай
• accusative: чай

So the form does not change, even though grammatically it is functioning as the accusative object.

This means:

• just not too strong
• only, not too strong

Here только does not mean only in the sense of limiting the tea itself. Instead, it means something like:

• just
• the only thing is
• except that

So the whole sentence means:

• I’ll take any tea, just not too strong.

This is a very common Russian pattern:

• что угодно, только не это = anything but this
• пойдём куда угодно, только не туда = we can go anywhere, just not there

Russian often leaves out words that are easy to understand from context.

Here, after Я возьму какой угодно чай, the listener already knows we are talking about tea. So только не слишком крепкий is short for something like:

• только не слишком крепкий чай

The noun чай is omitted because it is obvious.

This kind of ellipsis is very natural in Russian and English too:

• I’ll take any tea, just not too strong instead of
• I’ll take any tea, just not tea that is too strong

Because it agrees with the implied noun чай, which is:

• masculine
• singular

Even though чай is omitted in the second part, the adjective still reflects it:

• чай → masculine singular
• therefore крепкий

Compare:

• Я возьму какую угодно книгу, только не слишком длинную.
  (книгу is feminine, so the adjective becomes длинную.)

• Я возьму какое угодно вино, только не слишком сладкое.
  (вино is neuter, so the adjective becomes сладкое.)

The comma separates the main statement from an added qualification or restriction:

• Я возьму какой угодно чай, только не слишком крепкий.

The first part says the speaker is flexible.
The second part adds one important condition.

This is standard punctuation in Russian when только introduces something like except / just not / but not.

Normally, no. For tea, coffee, alcohol, and similar drinks, Russian usually uses крепкий to mean strong in the sense of concentration or intensity.

So:

• крепкий чай = strong tea
• крепкий кофе = strong coffee

Сильный is used for things like:

• сильный человек = a strong person
• сильный ветер = strong wind
• сильная боль = strong pain

So слишком крепкий is the natural collocation here.

Yes. In contexts like ordering food or drinks, Russian often uses verbs like взять in a way that English translates more naturally as:

• I’ll have
• I’ll take

So Я возьму какой угодно чай is perfectly natural in a café or similar setting, even though the literal verb is take.

Слишком means too.

So:

• крепкий = strong
• слишком крепкий = too strong

It modifies the adjective and sets a limit: the speaker is okay with tea in general, but not if it crosses that threshold.

Compare:

• слишком горячий = too hot
• слишком дорогой = too expensive
• слишком поздно = too late

Not exactly.

• слабый чай = weak tea
• не слишком крепкий чай = tea that is not too strong

The second is softer and less extreme. It does not necessarily mean weak. It just means the speaker wants tea that is moderate, not overly strong.

That is why не слишком крепкий is often the better choice if you want to sound natural and polite.

Yes, but the original order is very natural:

• Я возьму какой угодно чай, только не слишком крепкий.

Russian word order is flexible, but different orders may change emphasis. For example:

• Я какой угодно чай возьму, только не слишком крепкий.
  This puts more emphasis on какой угодно чай.

• Только не слишком крепкий, я возьму какой угодно чай.
  Grammatically possible, but less natural in ordinary conversation unless you want dramatic emphasis.

For a learner, the original sentence is the best model to remember.