What I have/had read about saving seeds is to use a cup of water. I used two cups of water in this situation because of there being so many seeds. I also used a 32 oz. container.
I just looked at the fermenting seeds. Around 50% of the seeds are floating.
There are no visual signs of disease, mold, fungal, etc. on the plants. There was BER on the inside of some larger tomatoes back in May - mid June. I did not save seeds from any of those BER infected tomatoes.
There's so much to learn