I have been making "Country Wine" costing somewhere south of £5 for 25L. I make this 20p a Liter, or 15p for a "bottle" of 750ml. It's well received by all of the drinkers, perhaps not too discerning, but no one spits it out and they all ask for more.
I make it pink with fruits, for marketing, and flavour with sweetener, malic acid, citric acid, and sometimes go further with juniper berries or citrus rinds.
The pink fruit colours are from frozen supermarket "forest fruits", totally optional. Either serve straight from the keg, or in a bottle with a little sugar added for "frizzante". Bottle opens with a puff of CO2, looks like a premium product in a bottle.
3kg sugar, yeast, flavoring, time, and it comes good. Extra flavouring to taste after fermentation. Maybe the £5 is an exaggeration. £2 for 3 bags of sugar. Teaspoon of acids and yeast, some sweetex tablets, pennies. 1/2 bag of fruit 50p. Maybe it is more like £2.50/25L, 7.5p for 750ml, but I am not really counting.
3000/25 = 120g/L sugar = ~ 6% alcohol
I like making stuff for cheap, like a magic trick, but it does not stop me spending £10 on a bottle of shop wine from time to time, just less often.