I don't know how I would function without free coffee

Caffeine pills :)

I would like free coffee but my boss is to tight

I took caffeine pills once in an attempt to pull an all-nighter... fell asleep after about an hour, but woke up amazingly refreshed

The company I work for has a side business selling small-batch coffees, so we get "samples" quite a lot haha

My basic understanding of drugs (caffeine etc) is that they take an amount of time to be effective like when you take paracetamol it takes a while to start working. So it is better to take caffeine pills/drink coffee before you start getting the effects of tired not once the effects occur.

They still may not be able to help you concentrate even though it keeps you awake.