Originally Posted by DoctorCAD
The full 1 gallon should have been made in a bucket for primary fermentation. A bottle should be used for secondary fermentation, which is much less aggressive.
It's fine in the jug. When it's done, it can be topped up then. It's not a very active fermentation, BUT I always put it into a tub or bin- I had purple juice come up to the top once and stain my hardwood floor, so I'm a bit paranoid.
You won't get a krausen like with beer, but you may get a little bit of foam. If you follow the directions I wrote, you'll be perfectly fine!