I have only had one batch go bad years ago. As I mentioned, it tasted good, but foamed after opening the bottle. Thru brew books, tracked it to the fermenter did not get cleaned well enough. The other folks I know of that had sour batches, were either foamy, or just tasted/smelled bad.
My batch years back was 5 gallons; at the time is was about $20
The optimum temperature is highly variable; it depends on the strain of yeast, the beer style and type. Most ales like around 65-70F. That is one reason they are popular; pretty much anyone can ferment at that temperature without fancy equipment. Lagers and Pilsners like fermentation in much colder; that is Lagering, to hold the beer at a cold temp.
For a beginner, cooking on the stovetop(that is how I started, as do most others), you would want a 20qt stock pot. Most people have one, and they are inexpensive if not.
- large (20qt) stock pot
- 2-1/2 cases 12oz bottles
- ingredients for 5 gallon batch
- Fermenting and bottling "kit"(fermenting bucket, lid, airlock, siphon hoses, bottle capper)
Ingredients for a 5 gallon batch run $25-35 nowdays. A fermenting and bottling "kit" can be put together from pieces or a kit, for $50-75 from most brew stores.
What I recommend, is hooking up with someone who brews, and sharing. This last weekend, my buddy had not brewed before. I have everything to brew 20 gallons. We split the cost, brewed 20 gallons. He just had to round up a bunch of bottles; free from friends etc. So his investment to try this out, was just the cost of ingredients($54 dollars each in this case). So for no investment, in this case he gets 5 cases of beer for $54, that he made himself.
The setup I use now is much fancier and expensive than stovetop, but I still use some of my original equipment; the system evolved over time.
When things do go awry, is it usually apparent why? How much are you throwing away (in terms of cash) when a batch goes bad? What is the optimum temperature for this fermentation process?
What are the start up costs?
You mentioned 10 gallons, that is 80 pints.....are you going to wind up with 80 pints? (In time for the superbowl, hopefully the 9ers will win this weekend eh? That's my pick anyway).