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Was wondering if there is a easy way to figure out what my abv of my apple pie is a did 4 gallons of juice with 2L of 190 prof is there a calculation or calculator anyone knows of

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one more stupid question is the yeast just normal bread yeast that i purchase at any gorecery store?

I found the calc actually but my question is let's say I do a 25l calc do I add those ingredients to 25 l of water or will it be 25 l combined

Is there a way to scale this down to a smaller batch. Size