Wulf Ratbane
Adventurer
Old One said:Is there something a bit less ambitious I could try?]
Well, you chose an ambitious effect.
Personally I think Chloral Hydrate is exactly what you want, and so I would recommend making a dual d20 roll + action point to get 'er done.
Chloral Hydrate
http://en.wikipedia.org/wiki/Chloral_hydrate
Chloroform is easier (DC24)-- but it's inhaled.
Atropine is "medicinal" and very easy to craft (DC14) but it's not as effective as you want (Injury, 1d6 Dex/1d6 Str).
http://en.wikipedia.org/wiki/Atropine#Side_effects_and_overdoses
You could also take a look at the MSRD "Skills I" file for a list of Craft: Poisons.
Let's see what everyone else wants to do in the first 8 hours of the day before you make any further checks.
Joshua's venom-lost ability score heals 2 points overnight.
EDIT: And if he does nothing but rest during the first 8 hours of the day while Brigitta was botching her second batch, he'll heal the remaining point.