Saya campur tepung dan air, lalu saya kacau perlahan.

Yes. In Malay, the subject is often repeated for clarity, especially in simple textbook-style sentences:

Saya campur tepung dan air, lalu saya kacau perlahan.

But the second saya can usually be omitted if the subject is clearly the same:

Saya campur tepung dan air, lalu kacau perlahan.

Repeating saya is not wrong. It just sounds a little more explicit.

Yes. Campur is the verb to mix.

In this sentence:

• Saya campur tepung dan air = I mix flour and water

Malay verbs often do not change form for tense or subject, so campur stays the same whether the subject is I, you, they, etc.

They are related, but not exactly the same.

• campur = mix / combine
• kacau = stir

So the sentence is describing two steps:

1. campur tepung dan air = combine the flour and water
2. kacau perlahan = stir slowly

In cooking contexts, this distinction is very common.

Lalu here means something like:

• then
• after that
• and then

It links two actions in sequence.

So:

Saya campur tepung dan air, lalu saya kacau perlahan.
means:

I mix flour and water, then I stir slowly.

It shows that the second action happens after the first.

Often, yes.

These can all connect actions, but the tone is slightly different:

• lalu = then / and then, a bit neat or narrative
• kemudian = then / afterwards, slightly more formal or neutral
• lepas itu = after that, common in speech

So these are all possible in many contexts:

• Saya campur tepung dan air, lalu saya kacau perlahan.
• Saya campur tepung dan air, kemudian saya kacau perlahan.
• Saya campur tepung dan air, lepas itu saya kacau perlahan.

Here perlahan works like an adverb, meaning slowly.

Malay often uses words that can function as either adjectives or adverb-like modifiers depending on context.

So:

• perlahan = slow / slowly
• kacau perlahan = stir slowly

Unlike English, Malay does not usually add a special -ly ending.

Yes.

Both are possible:

• kacau perlahan
• kacau dengan perlahan

The version without dengan is shorter and very natural.
The version with dengan can sound a little more explicit, like in a slow manner.

In everyday Malay, the shorter form is very common.

Malay verbs usually do not change form for tense.

So campur can mean:

• mix
• mixed
• will mix

The time is usually understood from context, or from time words such as:

• semalam = yesterday
• sekarang = now
• esok = tomorrow

In a recipe or instruction context, this sentence is usually understood as a present/simple procedural action:

I mix flour and water, then stir slowly
or
Mix flour and water, then stir slowly depending on context.

Malay does not use articles like a, an, and the in the same way English does.

So:

• tepung = flour
• air = water

Whether it means flour, the flour, or some flour depends on context.

That is completely normal in Malay.

No. Malay air is pronounced more like ah-eer in two syllables.

It means water.

So:

• English air = udara
• Malay air = water

This is a very common point of confusion for English speakers.

Yes. If you want it as an instruction, you would usually drop saya:

• Campur tepung dan air, lalu kacau perlahan.

This sounds like:

Mix flour and water, then stir slowly.

That is very natural for recipes and directions.

Yes, quite similar.

The basic structure is:

• Saya = I
• campur = mix
• tepung dan air = flour and water
• lalu = then
• saya = I
• kacau = stir
• perlahan = slowly

So the order is roughly:

Subject + Verb + Object, then another clause.

That makes this sentence relatively friendly for English speakers to understand.

You could use dan, but it changes the feel slightly.

• dan = and
• lalu = then / and then

If you say:

Saya campur tepung dan air dan saya kacau perlahan

it is understandable, but it sounds more like two actions simply being linked.

With lalu, the sequence is clearer:

first mix, then stir.

So lalu is the better choice here.