Storing yeast from bottle conditioned beer

[Llamaman]

Hi all

A deceptively simple question, which my Google-fu has failed to resolve;

I’m just drank a couple of bottles of a bottle-conditioned beer of which the yeast is useful (Fullers as it happens).
But, due to various circumstances (FV still in use and impending holiday) I can’t brew with it for a few weeks.
The bottles are drained of beer, and the yeast is stuck to the bottle.
What’s my best bet for this yeast?

1. Give it up. Just buy a couple more bottles nearer your brew day.
2. Leave the bottles upside down to completely drain, then cap until ready to build a starter near to brew day.
3. As above, but fill bottle with boiled, cooled water to expel most of the air.
4. Build a starter now to increase cell count, then cold crash and refrigerate until ready to step up near brew day.
5. Something else. Rain dance?

My hunch was 4, followed by 1. But interested to hear the thoughts of the Elders of HBF.

 

[Oneflewover]

My best guess (having absolutely no experience of it) is 4

 

[Llamaman]

I’m just drank

Clearly stronger than I thought!

 

[Leon103]

You would need to build these up before a starter (if brewing 23l), well if brewing anything really. Check the harvesting yeast thread but you could extract the yeast and pitch into a small starter, let it ferment and then put in the fridge and build up when you have more time.

 

[Llamaman]

You would need to build these up before a starter (if brewing 23l), well if brewing anything really. Check the harvesting yeast thread but you could extract the yeast and pitch into a small starter, let it ferment and then put in the fridge and build up when you have more time.

Yes, I know I would need to build up before brewing, and have done this in the past. My question is, if you can’t brew straight away, is whether it’s better to leave the yeast dormant and then build up as normal, or to increase numbers, let it go dormant again, and then build it up.
My hunch is the latter : more cells = more viability, right?

 

[Leon103]

I would do the first build up now, especially as it is sat with no beer on top.

 

[An Ankoù]

All of the above, but that's no excuse for not necking down a couple more bottles, just out of a sense of sheer badness!