Sounds like you knew what NOT to do, and did it anyways 
Were you that little kid whose mother told him a hundred times to not touch the hot stove, and you touched it 100 times anyways?!
LOL…well, I hope your plant bounces back for you…
Not all well water is good water. The pH can be extremely low (like mine), and if you have copper pipes that the water went through, then that low pH water will leach the copper into the water. If you let your well water sit in a container for a while and see a film settle on top, that’s from your pipes, and is not good for you, your plants, your clothes, the inside of your toilet, etc. There might be other issues with well water, like sulfur and/or hydrogen sulfide, etc. For young or vulnerable plants, it’s always good to have RO or distilled water on hand.
Again - good luck with your abuse victim…er, I mean, Romulan grapefruit 
