Nos bebemos versus bebemos
Is there a difference in meaning between:
"Nos bebemos agua" versus "Bebemos agua"
"eu gosto de chocolate" versus "gosto de chocolate"
Since the verb conjugates according to who is doing the action it's not necessary to add in the pronoun but many people add it in anyway, so I guess it's optional. My question is, does adding in the pronoun make any difference to the meaning, e.g. by adding in some kind of emphasis to the action.