Thats what normally happens yellow yeast culture at the bottom, booze on the top - this time the boozy stuff on the top is a thick slimey goo. Its quite funny, you can see the CO2 bubbles moving through it at about 1 inch every minute.When you add the packet of yeast it multiplies and exhausts itself consuming the sugar. The stuff in the bottom is mostly spent. There will be some live yeast amongst it and it can be cultivated to do the job again. But that's to much hassle for your requirements.