Disclaimer; I am brewing predominantly ginger beer, and experimenting with some commercial yeasts in pitching.
My batches of ginger beer are 1~2 gallons max, as it's consumed pretty quickly and I turnover the bottles/bug about once per month... sometimes twice. Up until now I've been using my homegrown ginger bug w/ naturally occurring yeast in my environment but I'd like to boost them a bit and try some commercial yeasts from a local home brew store.
When looking at the yeast packet, it recommends 11.2g yeast per 20~30 liters of liquid. I did the math and came up with 1 gallon = 3.785 liters, so that means I should be using 2.12g of yeast per gallon, but that seems like a lot since my bug is good, but not great.
I'm just trying to boost the carbonation levels per batch and thinking 1g yeast in addition to my bug should be adequate, but how to measure for a single gram? I tried using my kitchen scale (which is supposed to measure in 1g increments) but could not get it to register just one gram. I'm afraid to eyeball it as I want to have a basis for feedback per batch as to how much yeast was too little/too much and/or adversely affecting flavor.