じゃあ, 一緒にこれ飲もうよ。さっきマネージャーに差し入れでもらってさ。
Well, マネージャー is manager. If here was "dispenser" instead "manager" it would be understandable. So what "manager" doing here?
One of the meanings of 差し入れ is "food/provisions provided for someone (who is busy with some task)". So, the sentence could be translated as:
Well, let's drink this together. The manager brought it earlier for us [while we were working].
Another sign that マネージャー is a person here is the verb もらう, which can be applied only to people (though I guess personification is possible).
If you're not familiar with usage of もらう, here's a pretty detailed post on the four verbs to express giving and receiving:
http://lang-8.com/90163/journals/417636
In your sentence, the speaker received something from the manager and is expressing gratitude for it.
answered Jan 12 '14 at 2:31
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Nowhere in the original is gratitude expressed or "while we were working" said. – l'électeur Jan 12 '14 at 23:47
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