How much head space do we need in primary and then in the bottles?

[Elysium82]

hey guys,

I know there wont be a vigorous fermentation like with beer...but do we need to leave a few inches of headspace in the primary fermentation vessel? If yes, how much?
What about the bottles during the secondary fermentation?

Thank you.

 

[rushpapers]

Enough headspace in primary that your cloth covering doesn’t get saturated with Booch.

Enough headspace in the bottles to allow for the change in pressure, like an ounce of volume.