Everything you need to know about making t bag wine is here, ive made quite a lot using this method and only had good results
1 Box (20) Fruit 'Tea Bags'
2 litres Grape Juice
2lbs sugar (or thereabouts)
1tsp Citric Acid
1/2tsp Grape Tannin
GP Yeast & Nutrient
I've used 1 box Twinings Cranberry, Raspberry & Elderflower bags and Sainsbury's 100% Pure Pressed Red Grape Juice (not from concentrate, no preservatives, 3 for £2) but you could use any fruit infusions bags and red or white grape juice as appropriate.
Infuse the bags for 30 minutes in 2 pints boiling water.
Boil 2lbs sugar (or thereabouts) in 1 pint water.
I measured the SG of the grape juice at 1.068 and calculated that 1lb 12ozs sugar would give an OG of 1.110, and have read somewhere that boiling the sugar inverts it and makes it more fermentable.
Wring the bags out as best you can without splitting them and pour infusion liquor and sugar syrup into a bucket, add grape juice, allow to cool, add Citric, Tannin, Nutrient and Yeast and let it rip. After the initial whoosh has subsided, pour into a DJ and make up to 1 gallon.
Dead easy, and I cost that at around £3.50 per gallon or 60p a bottle at around 13% ABV.