I just recently started brewing beer in my kitchen. I'm doing 1 gallon batches and using a 12 quart (3 gallon) pot on my stove. I baought 3 brew kits(all grain) a Warrior IPA,Chocolate Stout and a Octoberfest each were $15 a piece. 1 Gallon of beer takes about 3 hours and gets me ten 12 ounce bottles. If im already in the kitchen cooking it really doesnt consume much of my time at all, its about the same as making a big batch of spaghetti.
Once I have consumed the 3 kits I plan to buy bulk grains and hops and this should place my cost per gallon down to $5 for 10 beers. I cook often so adding another pot to the stove isnt much of a hassle. I cool it in a ice bath in the sink. Super simple to do and really no extra equipment to buy. Its just like cooking, set timers and mix every 15 minnutes, siphon at the end and make sure to sanitize.
Not needed but helpfull I baought a induction cooktop burner for $39 so I can cook it beside my grill while I'm grilling out.