You need a still !Put it in a small tub or bucket, fill with distilled or non chlorinated water to about an inch above the feed and 1/2 cup vinegar and let it sit for 3-4 days or until it's bubbling. If it soaks up all the water add a bit more to cover. Once it's fermented strain the grains out and feed to the birds. Save the liquid and add more grains/feed/veg etc and water, do the same every day. I've had the same ferment bucket going for almost 2 years now.
