https://www.burpee.com/gardening-supplies/vegetable-fertilizers/organic-garden-lime-prod022801.html

I ordered 5 packs of this today. It's 75% off. Reviews say it works for BLossom end rot.

Also, bought something called tomato tone (I think) at Walmart and put that and more crushed egg shells around the plants. Got a big rain after I put all that out there. Tried picking all the badvlooking ones off. Hopefully, it won't happen to all of them

Does the epsom salt seem to be working for you or is it too soon to tell?