What is the smallest amount you could feed a starter with? Does it matter as long as you retain a 1:1:1, 1:2:2 ratio or something like that? Could you discard everything but 5g starter and feed it 10g flour and 10g water? If I use my normal starter canister, I probably won't be able to see any doubling due to the surface area of the box, but if I know how fast it usually rise, is that enough? Could also put it in a smaller container so it's easier to see.
I ask because when making pizza I use very small amounts (2-4%), and I don't want to feed more than necessary and throw away most of the starter.
Here's a video of some testing I did a year ago in a pretty small container.
