Do you know what's in your well water and how hard it is? If high ppm and high alkalinity you'll have to change your nutes once you have added back as much water as your pail/tub/rez holds to prevent the build up of the minerals in your water from throwing everything off no matter what kind of nutes you decide to use. The pH Perfect technology in the AN nutes will handle pH rise better than most. Our water comes from a dugout on my property and is around 400PPM and pH 8.4. We buy RO water for drinking so buy extra for my plants as I ain't growing shit with that water.
Getting my own RO unit just for the plants as it won't be sterile but the plants won't care. I'll just add a few mls of 29% peroxide to a 5gal jug to kill anything in it and let it aerate for a day before use.