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I have demi-johns, bottles etc but I don't know where to start.
I'd like to make fruit wines with whatever is in season at the moment. Just one demi-john to begin. Can anyone here give me a simple recipe with step by step instructions-for-idiots please?

There are a few simple wine recipies on the main site. For example:

Simple Grape Wine
Marrow Wine
Elderflower Champagne and Wine