Ova vrućina mi ne odgovara, pa pijem više vode.

Because vrućina is a feminine singular noun, and ova is the feminine singular nominative form of ovaj (this).

So the forms are:

• ovaj = masculine
• ova = feminine
• ovo = neuter

Examples:

• ovaj dan = this day
• ova vrućina = this heat
• ovo ljeto = this summer

In the sentence, vrućina is the subject, so it is in the nominative case.

Vrućina means heat, especially hot weather or the heat as a general condition.

So ova vrućina is like saying:

• this heat
• this hot weather

It is a noun, not an adjective. Compare:

• vruće je = it’s hot
• vrućina = heat

So the sentence is talking about the heat itself as a thing.

Mi is the dative form of ja (I / me), and here it means to me.

So:

• mi odgovara = suits me / agrees with me / works for me
• mi ne odgovara = doesn’t suit me / doesn’t agree with me

In Croatian, the verb odgovarati often takes a dative object when it means to suit or to agree with someone.

So:

• Ova vrućina mi ne odgovara
  literally: This heat does not suit to me

  Natural English: This heat doesn’t agree with me or This heat doesn’t suit me.

Good question. Odgovarati has more than one meaning.

Common meanings include:

1. to answer

   • Odgovaram na pitanje. = I’m answering a question.

2. to suit / to fit / to agree with

   • Ovaj posao mi odgovara. = This job suits me.
   • Ova hrana mi ne odgovara. = This food doesn’t agree with me.

So in your sentence, odgovara does not mean answers. It means suits or agrees with.

The context and grammar help you tell the difference:

• odgovarati na + accusative = answer something
• odgovarati + dative = suit someone

Here we have mi, which is dative, so the meaning is suit/agree with.

Because the subject is ova vrućina, which is singular.

• vrućina = singular
• so the verb must also be singular
• therefore: odgovara

If the subject were plural, you would use odgovaraju:

• Ove vrućine mi ne odgovaraju. = This hot weather / These heat waves don’t suit me.

So the verb agrees with vrućina, not with mi.

Here pa means something like:

• so
• therefore
• and so

It connects the two ideas:

• This heat doesn’t agree with me
• so I drink more water

It is very common in everyday Croatian and often sounds natural and conversational.

Compare:

• ..., pa pijem više vode. = ..., so I drink more water.
• ..., zato pijem više vode. = ..., therefore/that’s why I drink more water.

Both are possible, but pa is often lighter and more conversational.

Because pijem is imperfective, and here it describes an ongoing or repeated action: I drink more water.

• piti → pijem = to drink, be drinking, drink habitually
• popiti → popijem = to drink up, to finish drinking

In this sentence, the idea is not I drink up more water once, but rather I drink more water in general / because of the heat.

So:

• pijem više vode = I drink more water
• popijem više vode could suggest completing a larger amount, depending on context

For a general habit or response to the weather, pijem is the normal choice.

Because after više (more), Croatian normally uses the genitive.

So:

• voda = nominative
• vodu = accusative
• vode = genitive singular

Since voda is an uncountable noun (water), after više you get:

• više vode = more water

This pattern is very common:

• više vremena = more time
• više novca = more money
• više kave = more coffee

So više vode is the correct form.

Vode is in the genitive singular.

The base noun is:

• voda = water

Its singular forms include:

• nominative: voda
• genitive: vode
• accusative: vodu

Here it is genitive because it follows više.

So:

• Pijem vodu. = I drink water.
  (vodu = accusative, direct object)

but

• Pijem više vode. = I drink more water.
  (vode = genitive after više)

Yes, Croatian word order is flexible, but mi is a clitic, and clitics usually go in the second position of their clause.

That is why:

• Ova vrućina mi ne odgovara.

Here the first unit is Ova vrućina, and mi comes right after that.

You may also hear other orders for emphasis, for example:

• Mi ova vrućina ne odgovara — possible in speech, but less neutral
• Ova mi vrućina ne odgovara — also possible

Still, Ova vrućina mi ne odgovara is a very natural neutral order.

So the main thing to remember is:

• mi is a clitic
• clitics tend to appear early, usually in second position

Yes, but it changes the feel.

• mi is the normal unstressed form
• meni is the stressed form

So:

• Ova vrućina mi ne odgovara. = neutral, normal
• Ova vrućina ne odgovara meni. = This heat doesn’t suit me (maybe it suits someone else)

Use meni when you want emphasis or contrast.

For example:

• Tebi odgovara, ali meni ne odgovara.
  = It suits you, but it doesn’t suit me.

Yes. Croatian usually forms negation by putting ne before the verb.

So:

• odgovara = suits / agrees with
• ne odgovara = does not suit / does not agree with

Likewise:

• pijem = I drink
• ne pijem = I do not drink

In your sentence, only the first verb is negative:

• Ova vrućina mi ne odgovara = This heat doesn’t agree with me
• pa pijem više vode = so I drink more water

Sometimes in context it can refer loosely to a period of very hot weather, but its core meaning is simply heat.

So:

• vrućina = heat / hot weather
• toplina = warmth
• toplinski val = heat wave

In your sentence, vrućina most naturally means the heat or this hot weather, not necessarily an official heat wave.

A rough pronunciation guide:

• vrućina ≈ vroo-chee-na
• više ≈ vee-she

A few sound notes:

• ć is a soft ch-like sound
• š sounds like sh
• ž sounds like the s in measure
• č is a harder ch sound than ć

For English speakers, one tricky point is the difference between č and ć. In everyday speech, some accents make them sound quite close, but learners should still try to notice the spelling distinction.

Yes, it sounds natural.

It expresses:

1. a physical reaction or discomfort:
   • Ova vrućina mi ne odgovara
2. a consequence:
   • pa pijem više vode

It sounds like something a native speaker could easily say in daily life.

You could also hear close alternatives such as:

• Ova mi vrućina ne odgovara, pa pijem više vode.
• Zbog ove vrućine pijem više vode. = Because of this heat, I drink more water.

But the original sentence is perfectly normal and idiomatic.