Blossom End Rot

To rot or not to rot is the question! LOL really though, every single one of my yellow squash have succumbed to blossom end rot it seems.  I Google'd the predicament and read that the plant needs to increase the calcium intake.  Quite a few solutions were either to use crushed up egg shells that had sat in water for an extended period of time or Epsom salt.  I used the egg shells method and the squash are still exhibiting the rot problem.  Soooooo...any ideas and/or solutions as to how I can alleviate the issue???  I would love to taste at least one squash this year ;)