Hello, I am a first time wine maker. I planted elderberry tree's two years ago. And I got just enough this year for a small batch. I haven't bought all the fancy things I will need to use to make wine in the future so I used a basic recipe for my first run. http://www.ehow.com/how_4515073_homemade-elderberry-wine.html No yeast, just sugar and sitting in a crock. Anyway I followed this process on Saturday night and my concoction isn't bubbling yet. When should I get bubbles??? I have the Glass top to the Crock over it not plastic wrap. Should I use plastic wrap?