It is best to squeeze it fresh - and keep the uncut lemon in the fridge - or 
the unsqueeze bits I mean - not sure why you would squeeze 4 cups unless you 
were going to drink it stat - but if you wanted to keep it fresh I would freeze 
it in ice cube trays and use one cube as required?

xx

From: Deborah Gerard 

  Just squeezed four cups of fresh lemon juice...is it okay to add CS to the 
juice as a preservative?
  TIA,
  Debbie
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