Analog film photography and cameras

Really easy.

You need:

Paterson tank
Thermometer
Measuring jugs (£1 shop)
Measuring cylinder
Dark room or changing bag (changing bag means you can do it anywhere)
Some developer (you only need one but you might end up with about 5 different ones like I did)
Some fixer

The entire shebang can be had for about £20 of eBay or new for about £50.

I'd also add a patterson hose and filter (our water supply here is crappy), and a scanner for your negs

(I keep 2 developers - aculux and rodinal)