I've heard sugar and water can be notoriously difficult to brew. You need to add yeast nutrient and citric acid (either in powder or juice of a lemon) because yeast needs nitrates and slightly acid environment to thrive.Sugar and water,
1060 pretty much identical as start gravity. Got some more on now. starting point is 1.07
That said, if you've put 4kg of sugar in only half the amount of water you thought you had, it might be too concentrated for the yeast to survive. This is why when you want high alcohol you brew it up initially and then feed the yeast more sugar as it brews out.
No, sounds promising. The murky brown is the yeast multiplying and is good news. After a few weeks you'll see a thick sediment forming at the bottom and eventually the cider will start to clearAnd Jonny69, my Princes apple juice turbo has turned a murky orangey brown . Should I be worried?