Juicy Lemons

I won't know how many lemons I need until I know how juicy they are. Or less ambiguously: until I know how juicy they are I won't know how many lemons I need. Or even slightly less ambiguously: until I know how juicy the lemons are I won't know how many I need. Or least ambiguously: until I know how juicy the lemons are I won't know how many lemons I need.