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Moonbells. I didnt wash my flowers either and you shouldn't use hot water anyway as this will kill the natural yeast on the flowers.I followed the recipe here and mine was fine and now sadly nearly all drunk.Memo to myself ...make much more next year.
You don't need a demijohn for any wine.Just place a large polythene bag inside a bucket or oither contaner, place the must in the bag, close with an elstic band and gently squeeze the air out.
If you're worried stick it in the fridge (if you've space) -that should prolong it. I think it will probably be OK anyway -just a bit drier.