There’s also the “pavlis” recipe, or simply the potassium bicarbonate mix:
Make a concentrate of 10 grams per 100 mL, then use 1ml of concentrate per 1 liter.
Be sure to keep the concentrate in the fridge to slow down the growth of any civilizations, though. A 100ml batch lasts me about 6 weeks at roughly 4 shots a day.
For me, the single cup v60 is where it’s at for a great drink regardless of the cost, and you really don’t have to break the bank for a solid setup. A decent hand grinder, gooseneck kettle with a thermometer, and brewer can all be had within $200. Once you find a recipe you like and get comfy with the technique it’s pretty easy to make brews that are consistently better than most anything you’d get from a shop or cafe.
1zpresso makes nice grinders in the $100-$200 range, and I wouldn’t be very picky about the kettle unless you’re using an induction stove top. Hario v60 brewers are about $20.
If you want to put the grinding issue aside and try things before committing to tools, you might see if you have some local roaster/cafes nearby. Most that sell beans will also grind for you, and they should grind according to whatever brew method you want to try.