well you need to use only sound grapes (none already broken open) still on a bit of the vine & mash them in a colander then put them in a cheesecloth bag to squeeze the juice out, don't let air get to the fermenting juice until it's done, then put in STERILIZED bottles (this is very important!) and leave for at least a few months before drinking. There are lots of books and sites for this.
As for jelly, if you boil the juice in a copper pot for a good long time you don't need to use Sure-Jell, but I've never thought of Sure-Jell as a "chemical".
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