Well, all you really need is a bathroom you can get dark (and occasionally mess up), some reels, a thermometer, and you're set to go. Chemistry, of course. Though I have daylight tanks, I don't use them. Years of processing commercially on a sink line gave me the habit of developing in open tanks in the dark, and with a decent rod for the reels, anything deep and wide enough can become a tank.Joined. I keep looking at my old Minolta, my even older Zeiss and a newer Pentax Espio 738 compact and thinking they should not just lay about. Getting film developed over here though, ugh. Might have to invest in some darkroom gear. There's certain to be some floating about in the second hand markets.
In the meantime, I have both negative and print scanners to put to work
Unless you have a yen to shoot sheet film and develop it in trays, there's really no need for a darkrrom at all if all you want to do is develop but not print - for roll film anyway.
A Paterson Universal tank, a couple of reels and a darkbag for loading the film, and of course chemicals for processing.
If you want to get really basic, you can develop your film in instant coffee, vitamin C and washing soda. You'll still need fixer though of course.