Do you mean for fermenting feed??? It kind of depends on how many birds you have but I currently am feeding 19 chickens and 4 ducks using 1 5-gallon bucket...
This is the way I like to do it...
1 5-gallon (food-grade) bucket
1/4 cup unpasteurized apple cider vinegar "with the mother"
2 T. plain Kefir or plain yogurt
Feed to fill bucket about 1/2 to 3/4 full (I prefer mash, but crumbles or your own homemade grain feed may be used)
Water to fill bucket 1-2 inches above feed (I don't use the water from my sink as it's chlorinated and I want certain good bacteria to grow)
Long-handled plastic strainer spoon (plastic - do not use metal)
Add feed and water as needed - stir daily
"with the mother" is labeled right on the bottle but here's a couple of info bites on it:
Mother of vinegar is a slime composed of a form of cellulose and acetic acid bacteria that develops on fermenting alcoholic liquids, which turns alcohol into acetic acid with the help of oxygen from the air.
The mother is made up of the yeasts and fermentation byproducts that are produced when the cider ferments to vinegar, and you should shake the bottle up to evenly distribute it before you use it. The big commercial companies filter it out, because it makes the vinegar look like it's growing something--which indeed it is!
