I’m planning to brew two 5 gal. batches on the same day and i’m wondering if I can make enough starter for both with 1 vial of yeast. I have a vial of White Labs WPL001 w/ a best by date of Jan 2013. I plan to make an IPA w/ an OG of 1065 and an XPA w an OG of 1055. If it’s possible could you clue me in on the proportions etc. If not, I have an extra vial of the yeast but I’d rather save it for a future batch.