Why don't the Cullens keep a stockpile of stored blood (human or animal) on hand to use in crisis situations? If they had, then Edward would not have had to leave Bella alone to go hunt in chapter 23.
They don't keep human blood on hand for the aforementioned reasons: if they ever drank it they'd be at greater risk of killing someone. Since it obviously makes immense amounts of sense to store animal blood and they never do it in canon, I'm explaining this by saying that preserved animal blood would be so unpalatable that they couldn't possibly choke it down.
In the vein of the Harry Potter and the Methods of Rationality discussion threads this is the place to discuss anything relating to Alicorn's Twilight fanfic Luminosity. The fanfic is also archived on Alicorn's own website <strike>(warning: white text on black background)</strike>.
Previous discussion is hidden so deeply within the first Methods of Rationality thread that it's difficult to find even if you already know it exists.
Similar to how Eliezer's fanfic popularizes material from his sequences Alicorn is using the insights from her Luminosity sequence.
Spoilers for the fanfic itself as well as the original novels need and should not be hidden, but spoiler protection still applies for any other works of fiction, except for Harry Potter and the Methods of Rationality chapters more than a week old so we can freely discuss similarities and differences.
EDIT: Post-ginormous-spoiler discussion should go to the second thread. (If you have any doubt on whether you have reached the spoiler in question you have not.)