In a previous question "Tu mangi il pane" which translated as "You are eating bread" had the article "il" before "pane", so it is surprising here to find water shown as "acqua" rather than as "l'acqua".
You are right. There is no reason to use the article here (on in the "pane " sentence).
I am italian and we would never miss articles unless we don't want to make the meaning stronger in this case. Like you offer her some wine and her friends tell you she drinks water and nothing else, "Lei beve acqua e nient'altro".
Lei personal pronoun used to refer to the third person singular feminine Lei = She(En) - Ella(Es) - Sie(De) - Elle(Fr)
Lei can be used to refer to a second person formally Lei = You*(En) - Usted(Es) - Sie(De) - Vous(Fr)
but only if you talk directly to a person in a formal matter. like the german "Sie"
so in this case i`m right? because 1 and 3 were supposed to be with you and she.
If it doesn't specify the noun. It depends on the context. For example: She drinks water -> she doesn't drink wine. She is drinking the water, that means that water standing over the table over there.
The problem here is the pronunciation, you can't hear the "l'" even if it's sometimes there.
There doesn't need to be an article in front of "acqua" ...such as "l'acqua"?
Is it not right to call it "the water"? Just like it's l'italia, meaning...The Italy.
You only have on Italy so you need the article. But water is a common noun and doesn't need an article if you make some general statement. "Lei beve acqua perché è a dieta" but "lei beve l'acqua che sta nel bicchiere"