Se o frasco estiver bem fechado, dá para levar molho no tabuleiro sem sujar tudo.

Because after se when Portuguese talks about a possible future situation, it often uses the future subjunctive.

So:

• Se o frasco estiver bem fechado... = If the jar/container is properly closed...
• This suggests a condition that may or may not be true at the moment of carrying it.

This is very common in Portuguese:

• Se tiver tempo, telefono. = If I have time, I’ll call.
• Se chover, ficamos em casa. = If it rains, we’ll stay home.

Using está here would sound much less natural for this kind of future/open condition.

Dá para + infinitive is a very common way to say:

• it’s possible to...
• you can...
• it works to...
• it’s enough/suitable for... depending on context

Here, dá para levar molho no tabuleiro means:

• you can carry sauce on the tray
• it’s possible to carry sauce on the tray

It is a very natural, everyday expression in Portuguese.

Because dá para is being used impersonally.

Portuguese often uses dar in the 3rd person singular like this without naming a subject:

• Dá para entrar? = Can you get in? / Is it possible to enter?
• Não dá para ver nada. = You can’t see anything.

So in your sentence, dá para levar... is not really he/she/it gives. It means something more like it is possible to carry...

Bem fechado means more than simply closed. It suggests:

• properly closed
• securely closed
• tightly closed
• well sealed

Here bem strengthens the idea. So the point is not just that the lid is technically on, but that the container is closed well enough not to leak.

Frasco usually means a small container, often something like:

• a jar
• a bottle
• a container
• sometimes a flask in certain contexts

The exact English word depends on what kind of object it is. In this sentence, jar or container is probably the safest choice.

In European Portuguese, tabuleiro can mean several things depending on context, such as:

• a tray
• a serving tray
• a cafeteria tray
• a baking tray
• a board

In this sentence, it most likely means tray, especially the kind you carry food on.

No is a contraction of em + o:

• em o tabuleiro → no tabuleiro

Here it means on the tray or in the tray, depending on how English would phrase it naturally.

So:

• levar molho no tabuleiro = carry sauce on the tray

Portuguese often uses em where English uses on.

Literally, it says carry sauce on the tray, but in real usage it usually implies the sauce is in some kind of container, such as the frasco mentioned earlier.

So the idea is:

• if the container is well sealed,
• you can carry it with sauce on the tray
• without making a mess

Portuguese often leaves that kind of detail implicit if it is already clear from context.

Sem + infinitive is a very common structure meaning without doing something.

So:

• sem sujar tudo = without dirtying everything
• more naturally in English: without making a mess of everything

It expresses the unwanted result that is avoided.

Similar examples:

• Saiu sem dizer nada. = He/She left without saying anything.
• Abriu a caixa sem rasgar o papel. = He/She opened the box without tearing the paper.

Sujar means:

• to make dirty
• to soil
• to stain
• to make a mess of

In this sentence, it likely means that the sauce would spill or leak and make everything messy.

So sem sujar tudo is not only about literal dirt; it can also mean without messing everything up.

Tudo means everything.

Here it refers to everything around the sauce/container, for example:

• the tray
• the dishes
• the tableware
• your hands
• nearby items

So sem sujar tudo means without getting everything dirty or without making a mess of everything.

Yes. A more direct alternative would be:

• Se o frasco estiver bem fechado, pode-se levar molho no tabuleiro sem sujar tudo.

That means essentially the same thing.

The difference is mostly style:

• dá para levar = more everyday, conversational, idiomatic
• pode-se levar = a bit more neutral or formal
• é possível levar = more formal/stiff

O frasco means the container/jar, so it refers to a specific one that is already known or understood from context.

If you said um frasco, it would sound more like a container/jar, any one in general.

So:

• o frasco = the particular container we’re talking about
• um frasco = any container / a container

It can do both.

In practice, Se o frasco estiver bem fechado... can mean:

• If the container is well sealed... in this particular situation
• or something more general like Whenever the container is well sealed...

So even though the form is called future subjunctive, it is often used in general condition sentences too, especially after se.