Ooh! It’s pretty simple. You can do it in smaller batches, but the husband and I do it 5-6 gallons at a time. Your initial layout for a large batch might be expensive, but then you’ve got cider making (or beer- or wine-making) facilities forever. I’ll talk about the large batch; it’s what I’m most familiar with.
To start with the large batch, find yourself a local brewstore and ask for their brewing starter package. They’ll set you up with a primary fermenter (usually a 6 gallon plastic bucket), a secondary fermenter (generally a 5 gallon glass “carboy”), an airlock (to vent the carbon dioxide and keep out the nasties), some tubing, sanitizer, maybe some bottles and caps and a capping device. You can also get these mail-order; I’ll pimp my local brewstore, Midwest Supplies - they’re awesome and really helpful. We buy from them frequently, but never through the mail; I’ve heard their mail support is similarly good. Their starter kit is listed under “Equipment Kits” on the site; runs $80ish or so (the kit with the bottles and such is more).
You’ll also need brewer’s yeast, which you can get at the same brew store. We generally look for yeast specific to mead or cider - it’ll say on the package. Beer yeast or champagne yeast will also work. You can brew with bread yeast, but it’s not a good idea - the cider’s taste will be off.
Obtain yourself 5-6 gallons of preservative-free apple cider. Like I said earlier, we’ve had good luck with the widely-available Indian Summer brand, just make sure it’s their cider and not their plain apple juice.
Then, method:
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Clean and sanitize your brewing equipment - the primary fermenter, the airlock, and everything that will come into contact with the cider. This means any pots and stirring spoons. Use and sanitize plastic or metal spoons; don’t use that wooden one you use for everything else.
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In a pot, heat up 1/2 gallon of your apple cider - it doesn’t need to be boiling, just heated. The sugar will dissolve better.
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Add sugar to the hot apple cider and stir until dissolved. There’s some guesswork here to find what you like, but we’ve found 1 cup/gallon to be a good ratio. So, 5 or 6 cups.
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Pour the rest of the cider into your sanitized primary fermenter.
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Let the hot cider + sugar mixture cool to 100 degrees or so, then pour it into the fermenter as well. (It might not need to be that cool, as it’ll be going into such a large volume. Do be a careful about the temperature, though - too much heat in the cider in the fermenter will kill your yeast.)
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Toss in your yeast. If you’re using a powdered yeast, just sprinkle it on the top of the cider. If you’re using a liquid yeast, toss 'er in (after following any instructions on the package; some are “smack pack” type things that you need to smack first to break the seal).
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Seal the fermenter, then add the airlock. We sometimes use a cheap vodka in the airlock as the water sear, sometimes just water.
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Let 'er sit. Check the airlock for bubbles; that’s how you’ll know the yeast is working. Wait for 7-14 days to let the fermentation do its thing.
*9. Optional: Using a siphon, move most of the cider from the primary fermenter to the secondary. Transfer over as much as you can, but leave the gunk at the bottom. You’ll lose probably a half gallon or so doing this, but you’ll get a cleaner product at the end. After the transfer, top up the cider with more either cider or water to leave only 1-2 inches of space between the top of the cider and the bottom of the bung/airlock. (Using cider here will make it more apple-y, you could also add maybe a cup of sugar or so for sweetness.) Leave it for another 7 days or so.
- Bottle. You can bottle it as it is, for still cider, or you could add 1/2 c of sugar and mix that in to carbonate it. Carbonating it is harder as it runs the risk of little cider bombs - you’ll need to leave the bottles out and test one every day or so to see if it’s carbonated to where you want it, then toss the rest in the fridge to stop the yeast and carbonation.
I’m thinking you could also pour the cider into larger containers (like half gallon juice containers or growlers or whatever), but we’ve never gone this route. If you do, keep in mind that the cider will be a little like wine - you want to minimize the headspace as much as possible, and store it in containers that you’ll drink up within a day or so to avoid oxidation.
There’s more steps I could get into, like measuring the specific gravity with a hydrometer and such, but it’s not really necessary. Plus, you can find all that info and more recipes or directions in a web search - that’s how we developed a lot of our “recipe.” Your local brewstore (or Midwest) will also be more than happy to help you out and answer questions; it seems to be a universal truth for all brewstores or brewers I’ve ever seen.