I'm currently brewing 1 gallon batches. Say I have a liquid yeast smack pack that's for a 5 gallon batch. What I'd like to do is use about 1/4 to 1/3 of the pack and store the rest for later brews.
I've read all about how you can store yeast slurry from a previous fermentation, but I'm not convinced the process is the same for yeast straight out of a pack. For example, the nutrients will vary greatly between plain yeast and yeast plus trub. Also, the yeast is at different stages of activity in these two situations.
What I've thought of so far is to pour the remaining yeast into (sanitized) mason jars with pre-boiled water, but I'm worried this won't be enough to keep the yeast alive in my fridge for long. On the other hand, I don't want to feed my yeast with DME, or something similar, and have a bunch of brewer's fireworks go off in the middle of the night.
Does anyone have a practical solution for saving yeast directly from a smack pack or yeast packet?