This is a great thread.
This is what I'd do, based on everything here, plus a few of my own ideas:
1. Buy PET bottles (use lemonade or something else that's carbonated, ferment that too, and keep the bottles.)
2. A fermenter (there's always someone getting rid of one - keep scrounging until you have at least two though).
3. Get a decent yeast like Notto, treat it well and
reuse it indefinitely.
4. Onecan or toucan, maybe with a little sugar
5. Avoid infected beers by cleaning everything promptly, and by not touching your beer stuff with anything dirty. Use
bleach if you must - you might have to use a bleach preparation on the fermenters you acquire.
Once I'd saved a litte cash making my own drinks, I would get:
1. A stand capper and some caps. (Optional, if the PETs are working fine.)
2. Temp control, an old chest freezer (cheaper to run) and a heat source.
3. Thermometer.
Then I'd make a 5-7 litre stove top mash, I'd sparge with a colander and a kettle, boil the wort with some hops, and ferment the result with a ~15 litre onecan or toucan.