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