Hi. I'm a first timer and I used grapes from my grape vine. I turned the grapes into juice by heating and sqeezing through cheesecloth. Put the juice in gallon plastic jugs with the sugar and the yeast. Punctured balloons with a needle a few times and stretched over neck of gallon jug. Lots of hissing and foam leaking out and some of the balloons popped and sprayed wine everywhere. Why is the juice foaming so much? Should I have diluted the juice more -- it was pretty concentrated. I melted the sugar with 2 cups of water when adding to each gallon. 2 of the gallon jugs are working fine with the balloons expanding after a day. Thanks for any suggestions.