sanitize an old coke bottle of similar and pour some in there. Keep it in the fridge. 3 days before needed use that to make a starter and keep it warm. Make it up too about 500ml with either malt extract or sugar water with yeast nutrient added. Be sure to give it a good shake whenever possible if you dont have a yeast stirrer
I drain of the beer then wash th efv out with a litre of boiled and cooled water, then tip it into some sterilized Keller Jars. the yeast will settle and compact down. Mine lasts for months this way. I used to go to the palaver of washing and splitting into small amounts but don't bother now.
Around 100ml of slurry is more than enough yeast to pitch into 5 gallons of average strength Ale . . . Lagers and strong beers need more . You also need to use more slurry the older it is . . Use the Mr Malty pitching rate calculator to work out the correct amount
Did a brew last week and then found out I had no yeast in stock , so I just nicked some from another brew that was in progress.
Something I don't understand, there are lots of these, breweries keep their own strain of yeast going, but understand that yeast can mutate, so how many times is it reasonable to use yeast from an original source :?
A mate who works in a Goverment Lab gave me some Schott bottles they were chucking out - waste of public funds maybe as rife in the UK as well I expect :?
But being German made I expect they would be available to buy from labware suppliers where you are. These two have wort in them but they are the ducks nuts for storing yeast as well, because the bottles and the caps can even be pressure cooked and you can fill them with slurry and keep them in the fridge for months. A few of them are an investment that can last you your brewing career.