At a church meeting I recently attended, someone made a pot of coffee. When the pot was empty, another pot was made. After the meeting was over, the coffee pot was still about 1/3 full. No one wanted another cup. I don’t normally drink the stuff. (What kind of person, I wonder, would take beans from some plant, roast them until they’re nearly burnt, grind them into powder, pour boiling water onto that powder, then drink that water?) I had my own water-bottle, filled with iced tea, which I had finished. Before someone could dump the unwanted coffee down the drain, which was about to happen, I quickly rinsed my water-bottle and poured the coffee into it. As soon as I got the coffee home, I put it in another container and refrigerated it. I wanted to minimize the risk of the water-bottle I use for iced tea being ruined by the coffee taste, so I washed it as soon as it was empty. The next day I had all the iced coffee I wanted, for nothing more than the cost of some ice and milk.
The moral of the story is that if you look around you can always find things that people are getting rid of that can be of benefit to you if you do the work of obtaining them and re-purposing them. Get in the habit and you can get lots of things for free.