Growing yeast from a bottle of Dead Guy Ale
You can really do this with any unfiltered beer that has a layer of yeast on the bottom of the bottle. With this example I used Dead Guy Ale because I’ve had a lot of luck growing yeast from this beer.
First go out and buy a 6 pack of dead guy ale, you’ll need it and it’s good beer!
I saw on a YouTube video
First you need to sanitize the bottle with vodka around the cap of the beer. The used a lighter around the bottle cap before removing the cap, like in the video. Also make sure to sanitize the beer bottle opener with vodka. Open the beer and pour out 3/4th of the beer carefully not to disturb the layer of yeast in the bottom of the bottle. I then put in 2 teaspoons of sugar in the bottle, and capped the bottle with a new sanitized cap until it is ready to be used.
I grow the yeast samples in a mason jar commonly used for canning. Get a large canning pot, put the mason jar in the large pot and fill the pot with water so it is above the top of the jar. Bring the water to a boil. In another pot put in 1 7 oz. bottle of Malta Goya combined with 14 oz. water. Malta Goya is basically unfermented beer that is carbonated. Boil for 15 minutes. Malta Goya can be bought at Latino grocery stores, or online
Bring “wort” to a boil and boil for 15 minutes, to sanitize. Carefully get the Mason jar out of the boiling water, dump the water out and combine the boiling hot Malta Goya mixture. Run cold water over the Mason jar until it cools down, this takes a few minutes. Make sure to use canning tongs or something to hold the jar as it will be very hot.
Once the wort is cool open the dead guy ale bottle, sanitizing everything again and swirl the beer sugar mixture together to collect all of the yeast in there. Once the yeast from the bottle is combined with the wort close the lid and put it on top of your fridge or somewhere out of sight for several days. It took 3 or 4 days until I say yeast activity.
After I saw signs of activity I made more Malta Goya wort with 2 7oz. bottle of Malta Goya and 14 oz. water. I boiled the same amount of time, and chilled the wort in the kitchen sink with an ice bath. I put this new wort and the whole starter sample in a 1000 ml flask with a stir plate and stir wand for 16 hours. The next day I made a 1 gallon batch of beer with a pound of malt extract and a gallon of water (no hops this is grow yeast). It did come out to be a little more than a gallon.
Let the sample beer ferment out.
If this sample beer tastes like beer then wash the yeast and keep in mason jars until ready to brew.
See YouTube video
On how to wash yeast. I was able to get 4 mason jars of “smack pack” style of yeast. Don’t worry about the caramel coloring from the Malta Goya darkening your beer. I haven’t had a problem with it, but then again I usually brew darker beers.