El café me sabe un poco amargo hoy.

Me is an indirect object pronoun, and here it means to me.

So the structure is roughly:

• El café = the coffee
• me sabe = tastes to me
• un poco amargo = a little bitter
• hoy = today

A very literal version would be:

• The coffee tastes a little bitter to me today.

Spanish often uses this kind of structure for personal perception, especially with food and drink.

Compare:

• El café sabe un poco amargo hoy. = The coffee tastes a bit bitter today.
• El café me sabe un poco amargo hoy. = The coffee tastes a bit bitter to me today.

So me adds a personal viewpoint.

Yes. Saber has more than one meaning.

The two common ones are:

• saber = to know
• saber = to taste

In food/drink contexts, saber often means to taste.

Examples:

• Sé la respuesta. = I know the answer.
• La sopa sabe bien. = The soup tastes good.
• Esto me sabe raro. = This tastes strange to me.

So in your sentence, sabe is from saber in its taste meaning.

Because the subject is El café, which is third person singular.

Conjugation of saber in the present:

• yo sé
• tú sabes
• él/ella/usted sabe
• nosotros sabemos
• vosotros sabéis
• ellos/ellas/ustedes saben

Since el café is singular, the verb must be singular too:

• El café sabe...

If the subject were plural:

• Los cafés me saben amargos.

Spanish often uses the definite article where English does not.

With food, drinks, and general nouns, Spanish frequently says:

• El café
• La leche
• El pan

In this sentence, el café can mean:

• the coffee in question, such as the coffee I’m drinking now
• or, depending on context, coffee more generally

Here, because of hoy, it most naturally sounds like the coffee today / my coffee today.

Saying just café here would usually sound incomplete or unnatural.

Because amargo agrees with café, and café is masculine singular.

So:

• el café amargo
• un café amargo

If the noun were feminine, you would use amarga:

• la cerveza amarga

If it were plural:

• los cafés amargos
• las bebidas amargas

So the adjective changes to match the noun it describes.

Because un poco works differently depending on what comes next.

Use un poco + adjective/adverb:

• un poco amargo = a little bitter
• un poco raro = a little strange
• un poco lentamente = a little slowly

Use un poco de + noun:

• un poco de café = a little coffee
• un poco de azúcar = a little sugar
• un poco de paciencia = a little patience

So here, since amargo is an adjective, de is not used.

Good question. Spanish uses two common patterns:

1. saber + adjective

   • sabe amargo = it tastes bitter
   • sabe raro = it tastes strange
   • sabe dulce = it tastes sweet

2. saber a + noun

   • sabe a limón = it tastes like lemon
   • sabe a chocolate = it tastes like chocolate
   • me sabe a plástico = it tastes like plastic to me

So:

• sabe amargo describes a quality
• sabe a limón names a specific flavour

That is why your sentence has amargo without a.

Yes, you could, but it is not exactly the same.

• El café me sabe un poco amargo hoy focuses on how it tastes to me
• El café está un poco amargo hoy focuses more on the coffee’s state/quality

In real life, both can be used, but saber is especially natural when talking about flavour.

A rough contrast:

• Está amargo = it is bitter
• Me sabe amargo = it tastes bitter to me

So saber is often the better choice when you want to talk about the experience of tasting something.

Yes.

Both are possible:

• El café sabe un poco amargo hoy.
• El café me sabe un poco amargo hoy.

The version with me sounds more personal and subjective.

It is like the difference between:

• The coffee tastes a bit bitter today.
• The coffee tastes a bit bitter to me today.

So if you want to emphasise your own perception, me is useful.

Yes, hoy can move. Spanish word order is fairly flexible.

All of these are possible:

• El café me sabe un poco amargo hoy.
• Hoy el café me sabe un poco amargo.
• El café hoy me sabe un poco amargo.

The version with hoy at the end sounds very natural and neutral.

Moving hoy earlier usually gives it more emphasis:

• Hoy el café me sabe un poco amargo. = Today, the coffee tastes a little bitter to me.

So the end position is just the most straightforward, everyday placement.

No. It is not reflexive here.

It is an indirect object pronoun meaning to me.

Reflexive pronouns are used when the subject and object are the same:

• Me lavo. = I wash myself.

But in your sentence:

• El café is the subject
• me refers to the person experiencing the taste

So this is not reflexive. It is more like the pattern used with verbs such as gustar:

• Me gusta el café.
• El café me sabe amargo.

In both cases, me means to me, not myself.