How should eggplant be stored?
Eggplant should be wrapped in plastic and refrigerated. It will last 5-7 days this way.

It can also be frozen 6-8 months with the following process:


  
  Wash eggplant, peel and cut into 1/3 inch slices; 
  Blanch (plunge into boiling water) for four minutes in 1 gallon of boiling water to which 1/2 cup lemon juice has been added (to prevent discoloration) and chill quickly in ice cold water; 
  Drain off excess moisture, package in airtight containers or freezer bags and freeze immediately.
  


Source: StillTasty