I've made a turbo cider with 3L apple juice from concentrate, 500ml of elderflower cordial and 750ml elderflower pressé. None contained preservatives.
I used the cider yeast as instructed on the packet, added a very strong cup of tea and did not add any sugar.
It took 9-11 days to ferment and I bottled it today but I think it's spoiled. There is a vinegary taste to it but I'll see if conditioning it will help. I know it's hopeful but I've got nothing to lose.
My question is, have you used a pressé before in this context? What did you do differently when using it? And was the outcome any different?