Hi,
I would like to be able to bottle fermented beverages in screw cap soda bottles (reusing them after I drink the soda), and I'm looking for or will try to invent a screw cap with a pressure release valve. If such a thing exists I'd be interested in hearing about it. Otherwise I am thinking about something along the lines of inserting a false bottom in a bottle cap and putting a spring behind it so that when the cap is screwed closed, the spring will keep air out but if the pressure of the carbonation gets high enough, the pressure will push back the false bottom compressing the spring and allowing gas to escape before the bottle bursts.
Does anyone know if something like this exists or have any ideas on how to make one etc.
(I have a couple of fizz keepers (a piston type and a bulb type) does anyone know if these will release excess pressure?)
Thanks