One minute wine

Grape wine is simply fermenting the juice.
So buy a 2-3 litre plastic bottle of grape juice at the supermarket  Pour out half a cup and drink it.
Plug the top of the bottle with cotton wool and let it ferment naturally.
No need to add anything due to high sugar content. Drink anytime after foaming stops.

Do you need to add anything? 

Would have thought that grape juice had a liberal supply of preservatives in it to prevent the juice from fermenting.

Also wine uses wine yeast, not the assortment of stuff that may be floating round in the atmosphere.

Aren't wines started off with the skins and whatever else in the initial ferment also, these would add nutrients to the basic mixture that will also be absent in the grape juice.

so  how long on average would it take to turn in to wine?  Also where should it be left? eg cold garage? sunny window?? 

It turned out ok. I got a bit dizzy. It's not as good as the real thing probably a bit better than metho but that's not what it's about. We stuck it in the cupboard under the sink. drink in about 4 weeks or more .
The one minute refers to putting the cotton wool in.

several "the worst that can happen"'s
a)sour grape juice,
b)acid indigestion,
c)the trots,

shop grape juice is made with table grapes, wine is made from wine grapes (you probably wouldn't want to eat them) high in acid, minerals and tannin compared to eating/dessert grapes which is why home wine makers add tannin, acid and nutrient to shop juice.

Wine #1  http://www.winesathome.co.uk/forum/showthread.php?t=1562
check it out.